Question about 2003 GMC Yukon Denali

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Rear heating problem

The rear heating system does not heat up and we have noticed a antifreeze smell intermittently.

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Hi Jeff. I had the same problem, along with others on my 03 Denali. Along with not blowing hot air from the rear heating system, I had hot air blowing out of the passenger side and cold air out of the drivers' side vents. My battery would go low and had the same smell. I took my Denali in to the dealer and they found it was a bad Fan Control Module. They replace it and everything worked well after. It cost me $293 for parts and labor. Hope this helps.

Posted on Dec 29, 2011

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1 Answer

When running heat or defrost, the drivers side of the windshield will fog up....no leaking coolant or antifreeze smell.


Many times there will be no smell or leak noticeable . sometimes it is just the difference between the inside and outside air .

Sep 15, 2015 | Cars & Trucks

1 Answer

My temp is normal new tstat not noticed any coolant leaking anywhere. But I get a smell of antifreeze as soon as you turn heat on also heat doesn't get hot all the time any help?


If you smell coolant inside when you turn the heat its, because your heat condenser is leaking. You won't notice it because the drain port is outside at passenger side. You must have a very slow leak for now but eventually, it will get bigger then you will notice it.

Nov 15, 2013 | Cars & Trucks

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Not Overheating, Smells like really hot antifreeze after I drive, a/c ok heater heats but when stopped air gets cold...stummped..thermostat?, Leak?


check your hoses and make sure its not getting low because when it gets low the hoses can get hot enough to expand and spit out antifreeze without overheating

May 18, 2013 | 2008 Chevrolet Impala

1 Answer

I changed the heating core but now my windows are fogging up when i turn on my heat and i also smell antifreeze coming thru the vents what seems to be my problem???


heating core has been plumbed in wrong or most likely has a leak in the system, as you are smelling the antifreeze - seems to me like the antifreeze is not reaching the core, have you mistakenly plumbed the intake/out take the wrong way round?, this would cause the windows to fog up as the heat is being taken away fro the core rather than being taken into the heater core

Sep 13, 2012 | 1996 Ford Crown Victoria

1 Answer

Sugary burning smell while driving


That smell is most likely antifreeze. If the smell gets noticeably stronger when you turn on the AC/Heater, it is possible that your "heater coil" has started leaking. You will need the services of a professional if that is the case. Those are very hard to change.

Another possibility is your thermostat is not opening, causing your engine to overheat - steaming some of the coolant (antifreeze)/water mixture out of the system.

And thirdly, it is possible that someone spilled antifreeze on the radiator etc when adding fresh antifreeze - and you smell it after the engine warms up. If your car is not over-heating and you are not having to ad antifreeze/water to the radiator, then just keep driving. The problem will most likely go away.

I hope this is helpful to you. If yes, please take a sec to rate me. Thanks!
Don

Apr 04, 2012 | 2000 Chevrolet Impala

3 Answers

Have an antifreeze leak coming from either the heater coil or back of the motor not really sure.


I'm pretty sure if it were the heater core, you would have antifreeze soaking your carpet, and the inside of your car would smell of antifreeze. Your inside windows would also fog up when you turn on the heater.

Feb 24, 2011 | 1997 Kia Sportage

1 Answer

2000 lincoln Navigator I smell slight antifreeze smell through heat, checked over flow and the antifreeze in it was brownish have not noticed any moisture on floors but definately moisture on windshield. ...


Not much else. It is almost definately the heater core. The brownish stuff is rust. It may not be leaking bad enough to soak the floor yet, but it will.

Dec 03, 2010 | 2000 Lincoln Navigator

1 Answer

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You need to have the cooling system/heater core tested for leaking. Those symptoms sound like the heater core has failed.

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1 Answer

Need to flush the heatercore


your heater core has gone out, thats why there is no heat and thats from leakage of antifreeze. Usually when you can smell burnt antifreeze it usually points to a blown head gasket or cracked head, smell your exhaust and if you smell antifreeze theres your culprit

Dec 06, 2008 | 2002 Kia Sedona

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