Car Smells Like Antifreeze When Heater Is On

I got my car back from the dealership the afternoon of January 29th. I get an odor which smells like coolant. It goes to the line a third the way up and stays there. I have been getting a coolant or antifreeze smell in my 2007 Nitro SLT with 37,000 mi. There are several issues that may cause car smells from the heater core. i have a very strong coolant smell inside the car when heat is on and a strong coolant smell outside of the car. What you will smell is the oil. Coolant by-pass valve - 100K miles/160K kms This valve is between the engine and firewall and supplies coolant to the cabin heater system. All GM cars dont realy use antifreeze, they use dex-cool And when it burns, it smells like a cat that was on fire is extinguished by a skunk urinating on it. If the heater core of your vehicle is leaking antifreeze, that can cause a fairly intense smell inside your car. The heater core in your vehicle is important for keeping the inside of your vehicle warm: it pulls heat out of the coolant system in your vehicle an circulates that heat inside of your car. I would avoid any of the 'stop leak' products. TOM: It's not smoke. My car was giving off a bad smell every time I turned the heater on. The coolant reservoir also seemed like it was boiling inside. Other common signs of a bad heater core include a foggy windshield, a water surging sound inside the dashboard and wet carpeting on the front passenger side. If you can do the work yourself, a heater core can be replaced for $50 or less. Also, the window fogs up when the heater is on. The computer then uses this data to maintain optimum driveability especially while the engine is warming up and until it reaches operating temperature. The plastic housing of these valves can crack and the engine will start to loose coolant. If you do not service it it can be a lot worse. I had a smell in my 01 and it took me months to figure out it was a vent in the passenger side trunk. The reasoning is that when you smell something sweet from your dash vents, the usual culprit is a leaking heater core. I think maybe you have a slight leak in the coil(s) of your heater, and when you activate the *heating* system, the hot engine coolant that is diverted off of the water circulating pump begins to leak -- probably in a small spray that evaporates in the fan-blown air circulation and releases an unpleasant hot anti-freeze-laden-vapor smell into the car's passenger compartments. The odor itself will typically drift in through the AC ducts, and it may not last for too long, as the burnt fuse doesn’t make a continuous smells like some of the other problems on this list. Along with steam, your car’s temperature gauge will rest above the normal limit and you might notice a strange smell emanating from the engine. Turn the defroster on (hot and defroster vents, no AC) and see if you get steam on the windshield. But if the burning smell from car still presents even after you use the heater regularly, then you may have particles or some debris clogging the vent. I was browsing the archives and looking up a hot topic on heater core failure. Car smells like antifreeze outside One of the most common coolant smells is from a leaky heater core, cracked radiator, or damaged coolant hose. When you drive the car and have defrost mode on, does the windshield steam up from the vents and smell a. The heater core doesn't seem to be leaking in the floor. i've had my car back for a week now and again i have the strong coolant smell inside and outside of my car. It only smells like antifreeze burning when I have driven the car. Does your car smell like antifreeze when you drive it? If so, this could be a sign that your car's heater core could possibly be leaking. Its been making the smell since the day I bought it. If you notice your heater is producing an antifreeze burning smell then there is a good chance that antifreeze is leaking into the heating system. Coolant that smells like fuel. Actually kind of having the same issue, except mine is retaining the coolant I put in it. IGOTACUMMINS is an online forum and community for all Cummins Turbo Diesel enthusiasts. Yep definitely smell coolant What the hell GM? Seriously, what the hell? Also, actually edited this video outside of youtube In windows video editor. Antifreeze smell coming from my Jeep Cherokee? Why does my Jeep Cherokee smell like antifreeze after I've been driving for awhile and I shut it off. Is this normal? Is it possible that coolant was spilled somewhere and this is/was causing this? Don't tell me that it's a headgasket!!! Thanks. It is designed to prevent the coolant from flowing until the coolant reaches a certain temp. Before they leaked so much, it would drip onto the exhaust downpipe and just smell like anti. The Heater Core. Best Answer: what you are smelling is coolant. But the car isn't overheating. Sounds like heater core or a connection inside as already stated. Oddly enough, the area directly around the heater core does not smell and the area shows absolutely no sign of a leak in any way whatsoever. Symptoms: Your radiator (your car’s cooling system) is located at the front of your vehicle, so any coolant leaks will come from there. Hot antifreeze from the engine flows through it, and when you turn on your heater, that's where the heat comes from. the only thing that smells like anti freeze is the air coming from the vents. This may lead to some serious problems and damage to your car, so fixing it as soon as noted might save you from some unnecessary expenses. It could be coming from a radiator or heater hose, a failed intake manifold gasket or cylinder head. ANyone have any ideas? I spoke to my dad, who thinks that the car has run out of coolant. What most people don't know is that a car's heater core is also responsible for circulating warm air in a vehicles passenger cabin. This valve is right above the exhaust on the 2. If you turn on the defroster and you find that your windows fog up from the inside then it is the anti-freeze. Whatever the issue, it's helpful to know some of the common issues that can come with a weird sound or an odd smell. They all stem from a leak in the cooling system under the hood. I just bought the car but, I can smell what I think is burning antifreeze after I park it in my garage. Check all of the heater hoses under the hood. Sounds like its the heater core leaking. A vacum controled blend door mechanism allows the hot air to be dispensed. Your car will not neccessarily smell like Antifreeze if your water pump is going, in my personal experience it sounds like your HEATER CORE is shot. The challenge I now have is identifying the pipe that's to blame! I've added a photo of the offending article with the hope that someone can help? I've topped up the coolant a couple of times, and even when the engine is cold, there's a constant drip coming from the underside of either the pipe or connector. I can walk in a parking lot and tell if a car is leaking coolant. There was no visible leak anywhere. It goes to the line a third the way up and stays there. However, replacing a component such as a heater core tends to be pricier. The heater core could also cause this problem. The smell of coolant is notoriously strong, you can smell antifreeze a mile away from just a pinhole leak that can go on for months without your coolant level even dropping. A leak big enough for you to smell would let all the refrigerant out in a few minutes and you would hear a hissing sound. This may lead to some serious problems and damage to your car, so fixing it as soon as noted might save you from some unnecessary expenses. The challenge I now have is identifying the pipe that's to blame! I've added a photo of the offending article with the hope that someone can help? I've topped up the coolant a couple of times, and even when the engine is cold, there's a constant drip coming from the underside of either the pipe or connector. Took it to mechanic who replaced the. A sweet-smelling aroma and antifreeze smell could indicate that the car's heater core is leaking. The heater itself could be broken causing a burning smell from the antifreeze that is leaking into the heater vents. The heater core of your vehicle contains an antifreeze and water mixture, and it uses this mixture to regulate the temperature of the air inside your car. It smells more like acetone/nail polish, than coolant, but the radiator was replaced 2 weeks before Christmas, the new part could have put a strain on an older part? If you are running the climate system in auto, then yes, it would be directing the air to the feet and blowing it to the rear of the vehicle. Smell it and see if it smells like antifreeze. IGOTACUMMINS is an online forum and community for all Cummins Turbo Diesel enthusiasts. If you use an additive to try and stop the leak it might do it but it hasn't fixed the problem. both heater cores are good. I smell coolant after a good run but I can't find any leaks, anywhere whatsoever. Many people find that a plastic bag stuck in the engine will create a burning smell. “I noticed a chemical type odor coming through the heater vents. I shut the heat off immediately and drove the car to the airport and back without issues. It smells sortof like electronics. It contains ethylene glycol which can give off a sweet scent. * A sickly sweet smell –. I have read that the sweet smell coming from the vents could be a bad heater core, but would I also be leaking antifreeze from the front of my car?. Antifreeze was developed to overcome the shortcomings of water as a heat transfer fluid. Often times the heater core is buried under the dashboard, and replacing it, is a major job. i've had my car back for a week now and again i have the strong coolant smell inside and outside of my car. When driving, the heat from the engine and air flow, will make the leaked coolant dry up almost right away. As I was in the sun, I can see a fait mist but it went away as quick as it came. the heater, I smell inside the car, what smells like antifreeze. I took it to a mechanic who said my heater core needs replacing. Another insisted that I put some in his 34 Packard Eight. if it is, it is definantly your heater core since its located right behind the dash on the passenger side. Coolant circulates throughpassages in the engine block andcylinder head. There's a coolant smell that comes off the engine and can smell it while driving. I replaced my radiator hose and thermostat thinking that would fix my problem but it didn’t. We had been topping off the coolant in his car for along time, and were having difficulty finding the leak. Because coolant absorbs the heat generated by the engine and transports it to the radiator to cool down, it stands to reason that low or weak coolant levels mean its job performance is compromised and your car can overheat. As soon as step on the gas and start moving, it dissipates. But the car isn't overheating. If you smell burning from your AC unit, you probably have an electrical problem. while waitin i noticed the car heated up but the air never di. When that heater core gets a leak (usually pinhole size), the coolant make the sweet smell like syrup. I smell it at the drivers door when, I shut off the car and get out. I let him do this for $800. Many people find that a plastic bag stuck in the engine will create a burning smell. last week he used this radiator flush from Waynes and the instructions are to put the heater on full and let the car idle for about 20 mns. Also, the window fogs up when the heater is on. Antifreeze can smell like fish, and it CAN leak into the car through the heating system. Sounds like heater core or a connection inside as already stated. The heater core of your vehicle contains an antifreeze and water mixture, and it uses this mixture to regulate the temperature of the air inside your car. I have read that the sweet smell coming from the vents could be a bad heater core, but would I also be leaking antifreeze from the front of my car?. Before they leaked so much, it would drip onto the exhaust downpipe and just smell like anti. Still scratching my head on this. Anti-freeze smell is a very sweet smell and is usually detected inside the vehicle. You will end up with Anitfreeze all over you passenger. I have not felt anything different in terms of loss of hot air coming from the vents. antifreeze smell through vents. I got my car back from the dealership the afternoon of January 29th. This smell needs to be removed, not only because it causes discomfort for other passengers, but also because the micro-organisms behind it can cause allergy-type illnesses. However, replacing a component such as a heater core tends to be pricier. It's like hitting your head against a brick wall and. I'm assuming it's a sweet smell?. theres no apparent leaks and it isnt losing coolant. The computer then uses this data to maintain optimum driveability especially while the engine is warming up and until it reaches operating temperature. I originally contributed it to new car smell. I have no clue what could have caused this. What could it be?” “Can I drive my Mini Cooper with a coolant leak?” It’s not uncommon for Mini owners to experience problems related to coolant leaks. It has a syrup smell inside pretty strong. It might also mean you missed your pancakes when you were pouring syrup. Hey - Check your heater hoses!! They are RIGHT over the exhaust down pipe. temp according to guage when warmed up. My car has 118000 miles. Your problem may not be the exact problem I have but if the leak is very slow, it won't hurt the car to drive it providing you don't let the level get too low. Sweet-smelling (but toxic) ethylene glycol is leaking from somewhere. Also, the window fogs up when the heater is on. I got my car back from the dealership the afternoon of January 29th. I checked all the hoses & there doesn't seem to be any leaks. You won't smell oil unless it's actually burning in a decent quantity, such as dripping on the exhaust. Actually kind of having the same issue, except mine is retaining the coolant I put in it. Several things can potentially go wrong with automotive heaters because, much like a home heating system, there are many components working together to heat your car. Unlike antifreezes used for automotive application, assortment of boat antifreezes is more complex. also the pass side floor would be wet/stained from a leak. You will end up with Anitfreeze all over you passenger. Tonight was a colder night and my wind-shield got a "slime" on it from the heat - I believe it was antifreeze and it smelled so bad. Antifreeze was developed to overcome the shortcomings of water as a heat transfer fluid. Sweet-smelling (but toxic) ethylene glycol is leaking from somewhere. What Happens To A Car Without Coolant Or Antifreeze?. Download Image. It's like hitting your head against a brick wall and. Those "air pockets" travel thru to the heater inside the car and WILL make it blow cold, as there is nothing (coolant) to be the heat source. If you do not service it it can be a lot worse. Leaking coolant usually escapes from the floor vents as the core sits in a molded plastic recepticle in the "HVAC" unit. Oh and sometimes the smokes comes in thru the air vents. Replacing a broken pipe or hose is often quite simple and fairly inexpensive. This is normally in the heater motor. The carpeting has felt totally dry for several weeks, but the smell is still there. If you only notice the smell outside the car, the leak is in the coolant compartment. Let remaining water drain from heater. I sprayed some Lysol in the cabin air intake with the fans on high and doors open - funk was gone after that. However, maybe the heater itself is broken and the. Hot coolant drips from either a damaged heater core or a loose/deteriorated hose. Smoke coming from A/C vents-smells like antifreeze I was driving on the freeway and I noticed a smell of hot antifreeeze and I assumed it was the car in front of me. It's mixed in with the r134 and smells a little like atf. The challenge I now have is identifying the pipe that's to blame! I've added a photo of the offending article with the hope that someone can help? I've topped up the coolant a couple of times, and even when the engine is cold, there's a constant drip coming from the underside of either the pipe or connector. Also, a heater component could be melting, and this could smell like plastic too. Question: Low coolant level warning problem with my 2007 Pontiac G6 3. Several things can potentially go wrong with automotive heaters because, much like a home heating system, there are many components working together to heat your car. I had a smell in my 01 and it took me months to figure out it was a vent in the passenger side trunk. Sounds like you have a leaking heater core. The corrosion inhibitor stuff, that does wear out after a few years, that's why the flush ritual. It may be from toxic liquid ethylene glycol, otherwise known as antifreeze or engine coolant. In the last week I keep noticing, when I first start my car the vents smell like antifreeze. Question: Low coolant level warning problem with my 2007 Pontiac G6 3. When you drive the car for awhile see how long the rad holds pressure. For what it's worth, my own car (Peugeot 406) has this smell without any loss of coolant nor any leaks on the heater. Yes you are NOT running the heater…however water/antifreeze is still circulating through it. One of my good classic car pals lost a $5000 honeycomb radiator to permanent antifreeze. This is normally in the heater motor. If it's smells sweet, could very well be the heater core. Air that blows in smells damp, musty, or like mildew and mold; Your cabin does not warm up in cold weather, or is just a little warmer than outside; The defroster takes longer than typical to operate, or does not operate; Your heater or A/C only functions when driving, not when idling, or quits blowing when the car is stationary. Smell One: Maple Syrup. no heat with antifreeze smell 5 Answers. In late 2016 my upper heater hose swelled up like a balloon, and then burst, another 150 dollar repair. This OneHowTo article will explain in detail How to get rid of bad smell from car air conditioner. Heater core is like a mini radiator that's used to HEAT the cabin of your car during the winter. Now, at the heater core, there is a coolant that might simply start leaking and reaching the heating system or air-conditioning system, which causes that car smells like burning rubber. The problems it had were the same. So I grabbed a thick rag and. She gets in an immediately goes “WTF is that smell? It smells like rotting fruit in here!”. If the smell is coming from inside the car only when the heater is turned on, the problem is either with the heater core or the heater hose. Those "air pockets" travel thru to the heater inside the car and WILL make it blow cold, as there is nothing (coolant) to be the heat source. You will more than likely see coolant dripping from the drain tube located in the plenum part of the heater case that is mounted to the firewall if the leak is bad enough. Antifreeze in the cooling system Heater hoses In the heater, hot coolant circulatesthrough a matrix, heating the air which isblown into the car. There was no visible leak anywhere. The heater core could also cause this problem. Now, at the heater core, there is a coolant that might simply start leaking and reaching the heating system or air-conditioning system, which causes that car smells like burning rubber. this smell disapates while driveing and just started during our recent cold snap -20 degrees below zero. Antifreeze has a sweet smell like pancake or maple syrup. IT'S MAKING ME MENTAL!. No signs of leaks under the hood or under the car, nothing at the turbos, rad stays full. I'm assuming it's a sweet smell?. It might also mean you missed your pancakes when you were pouring syrup. The heater core is responsible for circulating warm air in the car's passenger cabin. also the pass side floor would be wet/stained from a leak. But if the radiator has a leak, there will be insufficient coolant to cool the engine temperature of your car. The smell is not coming from the exhaust. Heater core is like a mini radiator that's used to HEAT the cabin of your car during the winter. It had the smelly, wet, and yucky carpet in the passenger side floor pan. I have been getting a coolant or antifreeze smell in my 2007 Nitro SLT with 37,000 mi. Burning Wire Smell If your hot water heater smells like a wire is burning, or any other electrical-type of smell, this could signal issues with your wiring, most likely one due to arcing – a type of discharge that happens when two loose wires make intermittent contact. took vehicle into the dealer, was told there is no coolant leaking. Unlike antifreezes used for automotive application, assortment of boat antifreezes is more complex. Cars today are incredibly complex and sophisticated because a car's computer controls mostly everything in a car. People often find plastic bags and other objects stuck in the engine, causing the frustrating issue that car smells like burning plastic. Another suggestion to check the heater core. After thorough flushing (keep flushing for a little bit after you no longer smell antifreeze) turn off city water or pump. The smell is not coming from the exhaust. Heater cores are responsible for circulating heat inside. There was no visible leak anywhere. I sprayed some Lysol in the cabin air intake with the fans on high and doors open - funk was gone after that. “I noticed a chemical type odor coming through the heater vents. foam started coming out of the air vents in the car now I don't think the accident had anything to do with the aircon stories, just trying to paint a bigger picture. I cannot swear that it is antifreeze, it just smells like it. Top the radiator off, drive the car with the heater full on, then park it and look for the steam. Replace drain plug. Air that blows in smells damp, musty, or like mildew and mold; Your cabin does not warm up in cold weather, or is just a little warmer than outside; The defroster takes longer than typical to operate, or does not operate; Your heater or A/C only functions when driving, not when idling, or quits blowing when the car is stationary. ” “I see blue liquid under the front of my car. Smelling antifreeze when I run heat. Car Smells Like Its Burning And The Engine Coolant Leaks Have Fixed The Hose What Else Can It Be My car smells like it’s burning and my engine coolant is leaking rapidly. Its a raw smell of fuel coming out, not anti-freeze. A green damp spot on the front passenger side carpet or mat is usually evidence of the leak. Turn the car on and then turn the heater on high to determine if the antifreeze smell is coming from inside or outside the car. I have an 06 Chevy Impala. I was browsing the archives and looking up a hot topic on heater core failure. If you leave the dial all the way on cold it should cut down on how much of the smell/steam you get, but you're gonna wanna replace/repair that soon. No coolant in the oil. I'm just going through this with my Jaguar XJ8 daily driver. If you have a burning smell coming from the heater and you have clean it, then it is a good idea to have it checked out to make sure nothing serious is wrong. When there's white smoke, check first for coolant leak. The type of antifreeze that is required for a certain motor boat depends on the engine location and design. It goes to the line a third the way up and stays there. This only happens when I first turn on the heat or defroster when my car is cold. Whether your car heater or A/C smells sickly sweet, simply stale, acrid like burning rubber, or distinctly urine-tinged, all of these different gross car heater smells can be associated with a specific problem, which means each also has its own specific fix. It had the smelly, wet, and yucky carpet in the passenger side floor pan. This component circulates warm air inside the passenger cabin. It might be coming from a leaky radiator cap or the radiator itself, especially if you smell it outside the car. The smell goes away shortly after being started but always returns when I re-start. Before going to the repair shop, though, you can check to see if the following reasons are causing that unnerving scent. The heater core is responsible for circulating warm air in the car's passenger cabin. Once exposed to a flame it produces fozine gas, its an awful smell and is very hard on a person. A heater core is a radiator-like device used in heating the cabin of a vehicle. when I took the radiator cap off it was very hot. Do you smell the semi-sweet odor of antifreeze/coolant. Yeah, sounds like a leak in your heater core - it's buried in the dashboard and passes coolant through it for heating the cabin. It draws warm the heat from the coolant and then spread it across the cabin. This is normally in the heater motor. Basically it is the cam covers leaking oil slightly from the bottom corners nearest the bulkhead, onto the exhaust manifolds. Average repair cost is $700 at 29,200 miles. Like I said, I'm not familiar with the layout in the engine bay of your car, but the holes where the lines go into the heater core are a breach point for the heater box. Its been making the smell since the day I bought it. I tried Blue Devil after reading a lot on it, the leaking has stopped and I haven't had to put any new coolant in in two weeks, but there is now a strong smell of coolant whether I run the A/C or the heater. Coolant does raises the boiling point of the cooling system in. The heater core in your vehicle is important for keeping the inside of your vehicle warm: it pulls heat out of the coolant system in your vehicle an circulates that heat inside of your car. However, maybe the heater itself is broken and the. My car was giving off a bad smell every time I turned the heater on. The radiator has the coolant/antifreeze, which keeps the engine cool. I will try this. Also, if you have a slimy film coating the inside of your windshield, that would tend to confirm that your heater core is leeching antifreeze into your cabin air stream. If your car smells like maple syrup it might mean a coolant leak. Re: How to get rid of RV Antifreeze smell in fresh water tank? I would like to recommend an excellent resource for you to access (in addition to this forum ) rvdoctor. probably got a dose of coolant laden air through the fresh air vent when the top hose blew, once coolant is on the heater core it will smell like coolant for ever until U pull the core and thoroughly clean it. Antifreeze has a sweet, syrupy odor, and smelling it inside a car usually means there’s a leak somewhere in the cooling system. Not a single thing has not been changed in regards to the coolant circuit and I can STILL smell coolant very faintly when the heat is on. Does your car smell like antifreeze when you drive it? If so, this could be a sign that your car’s heater core could possibly be leaking. Well, that foulness followed me into the car. Question: Low coolant level warning problem with my 2007 Pontiac G6 3. Many people find that a plastic bag stuck in the engine will create a burning smell. SEAT Leon - No coolant and heater issues. I'm just going through this with my Jaguar XJ8 daily driver. Put it in the garage over the weekend after a long drive, and the smell was overwhelming. It doesn't take much coolant to make a whole lot of stink, especially if its in the heater core. Smelling antifreeze when I run heat. Coolant does raises the boiling point of the cooling system in. On occasion, other antifreeze leaks can be smelled inside the car while driving because the fumes are pulled in through the cabin air intake. If your car smells sweet like pancake syrup, it is probably due to your antifreeze coolant that circulates in your car’s heater and/or defroster. Also coolant sounding like it's boiling My car has an automatic transmission. If I turn the temp down no smell. But if the burning smell from car still presents even after you use the heater regularly, then you may have particles or some debris clogging the vent. Prestone® is the number one branded consumer choice for antifreeze/coolant, brake fluid and power steering fluid in North America. Fins attached to the core tubes serve to increase surface for heat transfer to air that is forced past them, by a fan, thereby heating. My car had what I thought was a coolant-like smell when turning on the heater or a/c. The heater core could also cause this problem. This may lead to some serious problems and damage to your car, so fixing it as soon as noted might save you from some unnecessary expenses. When there's white smoke, check first for coolant leak. much like what has already been said, possibly a blown head gasket. The heater core in these trucks constantly circulates coolant. Somewhere the exhaust was getting into the water jacket and that was pushing the coolant out. Has anyone else experienced this. while waitin i noticed the car heated up but the air never di. If the smell is coming from inside the car only when the heater is turned on, the problem is either with the heater core or the heater hose. If it's smells sweet, could very well be the heater core. There are a lot of reasons your heater might smell and the severity of the situation depends on a few things like the timing of the smell, the type of smell and where it is coming from. The burning smell can come from either a blower motor that overheated or a mechanical failure of some sort. No more smell, rock solid temp gage and a solved problem that I think has been like that at. Antifreeze in the cooling system Heater hoses In the heater, hot coolant circulatesthrough a matrix, heating the air which isblown into the car. Leaking coolant smell. When you drive the car for awhile see how long the rad holds pressure. I believe I have to replace the heater core, but really don't want to of course unless it's absolutely necessary. This component circulates warm air inside the passenger cabin. A crack in the heater core will discharge antifreeze and you will get the odor inside your car. I was hoping it would stay out there and we could drive off into the sunset. No coolant in the oil. Does it smell like burning antifreeze? Usally it means that the heater-core is going bad. 5L v6 engine is loosing anti-freeze. The 2011 Chevrolet Cruze has 41 problems reported for anti freeze smell in the car. If both hoses are warm after the car's temp gauge comes off COLD, the thermostat isn't stuck. You can also have parts of the heater core itself melt which causes a burning smell. This is normally in the heater motor. coming from the rear of the car. lately hes been smellin antifreeze but he cant find any leaks or puddles on the ground. The remedy is spending 8 hours taking apart and reassembling the dashboard to change out the heater core or fusing two hoses. However, maybe the heater itself is broken and the. This component circulates warm air inside the passenger cabin. Electrical Short. It may be from toxic liquid ethylene glycol, otherwise known as antifreeze or engine coolant. TOM: It's not smoke. A car’s coolant system operates on a loop, pumping a mix of water and antifreeze to your radiator to regulate engine temperature. No oil in the radiator. 2005 tj smells like coolant when air/heat is on. Starts/idles/drives great. I get an odor which smells like coolant. IT'S MAKING ME MENTAL!. Also, the window fogs up when the heater is on. THANKS! I did that yesterday and the antifreeze levels are the same. Antifreeze has a sweet, syrupy odor, and smelling it inside a car usually means there’s a leak somewhere in the cooling system. Fins attached to the core tubes serve to increase surface for heat transfer to air that is forced past them, by a fan, thereby heating. The radiator has the coolant/antifreeze, which keeps the engine cool. No coolant in the oil. Putting some context to the other answers here: * Your car heater contains a loop that splits off the circulating coolant (anti-freeze) in your engine. Auto Diagnosis - What's That Smell? Remember that new-car smell? Actually, new cars haven't had that smell since manufacturers took the solvents out of the glues in the interior in an attempt to. Also coolant sounding like it's boiling My car has an automatic transmission.