Question about Dodge Ram 1500

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Vapor comeing out of vents with heater turned off. smells like coolant not leaking on floor and not fogging windows up like when my heater core went bad 3 years ago and had it replaced.

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Sounds like you have a small leak in the heater core. this is a small radiator that fits in the heating system to provide the heat in winter. It is an extension of the cooling system and therefore has antifreeze in the core. You may just have a hose leaking a tiny bit around the connetion.

Posted on Apr 09, 2011

  • Michell Bowie
    Michell Bowie Feb 11, 2012

    I drive a 2001 LINCOLN TOWN CAR and have replaced the heater core twice in thirteen months. The cause is electrolysis, the core is getting electricity shot to it. It can take months before it starts visibly blowing out the vents. But the thing you should know is if you're in the car a lot you will become sick from breathing and absorbing the antifreeze on your skin. Headaches, anger, dizziness and feeling like you could fall asleep at the wheel. Also, your thought processes or brain is affected. If you wear contacts they will get a film on them and have blurry vision. I know this because I'm a limo driver for nine years and in the car 12 hours a day and had four different town cars with this problem. Ford motor company knows about the issue with the 98' to 2002 heater cores and have done nothing.


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My 2001 jeep grand cherokee has a dark mist/smoke coming out of the vents, and defroster. But, the heater works fine. What could it be?

DO NOT USE STOP LEAK!!!!!! That stuff has no brain so you cant tell it to plug only specific leaks. It will go for the easiest hole to plug which can be a water port in the cooling jacket for the cyl heads. replace the heater core. Fix it right or bypass but please please please do not use anything that will stop a leak

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Vapor emitting from vents of 2005 toyota camry SE

Sounds like you may have condensation in the vent channels. However, not sure how much of an issue it is.

If it were a heater core, you'd notice the coolant smell and fogging up of the windows ONLY when your heat is turned on, not cold air, because when you turn up the temperature, a door adjusts to direct air through the heater core and if it's leaking there, that's when the vapor comes.

So, with it being cold and having vapor, my question is now this: is it constant? Did you have it on heat and then switch it to cold? A temporary burst of vapor shouldn't be anything to worry about. Something more constant sounds like something that should be diagnosed by a tech.

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Climate control system blows only through the defroster vents and not through the passenger compartment vents; the windshield fogs in high humidity and windshield wipers are necessary to clear the fog. ...

If the fogging is plain moisture and not coolant (it would take on a green hue and you would smell coolant if this is the case) than the issue is with the blend door actuator. This component diverts air from the window, to the vents and floor. You may have a "stuck" door or a defective blend door. If it is coolant you are seeing (smelling), you may have a bad heater core. When bad, a heater core will dispel green vapor through the defroster vent.

Assuming the problem is merely the blend door, you may be able to free the part (if it's stuck) by locating it (usually under the glove box or between the glove box and middle console.

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Windows fog up

Could be either a plugged vent tube in the heater box [ it's on the lower outside of the firewall ] letting the water puddle and then evaporate when heated, or a leaking heater core. If it's the heater core, you will smell coolant inside the car and may have a wet area on the passenger's side floor.

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This is usually a sign of a heater core that has a leak. check for low coolant level in your radiator. there is a condensate drain for the blower box, see if coolant is dripping from the drain under the truck. To make a temporary repair, after confirming leaking heater core, loop one of the heater core hoses back to the engine, bypassing the heater core. I say after confirming because the heater core hose nipples break easily when removing hoses. The smell in the cab would be a sweet smell from leaking coolant.

On a very humid day fog can be seen coming out of vents when using the AC. This would be a normal condition.

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Heater immediately fogs all windows and there is a sweet odor in the cab of 2003 Buick Rendezvous, defroster works fine, but will not clear the windows after heat is put on

Sounds like a possible heater core failure(hole in it) the smell indicates to me the coolant(anti-freeze) is leaking into the passenger compartment.
Check the carpet in front of the front passenger seat for moisture, this would confirm heater core leak.
Good luck !

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On my 1998 volvo s70 the floor is wet with coolant on the drivers side and when using the a/c you can smell freon and you can see a white fog coming through the vents

Your Heater Core is Bad= Coolant on Pass Floor
If A/C Does NOT blow Cold anymore the Evaperator Core is Leaking
First time I have seen them BOTH go Bad in 30 rs of Bein A Mech/Tech

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Coolant vapors coming through vents

Sounds to me like a leaking heater core, probably just started. Quite an extensive operation to replace. If you happen to be in a cold climate, the windows will undoubtedly fog up. Hope this helps

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The early sign of a heater core leak is the smell of coolant, the reason is that only vapor is leaking now, it will gradually get worse in most cases and coolant will start comming out the heater box condensation drain.

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