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Anonymous Posted on Jan 17, 2010

1999 Dodge Ram 1500 4x4 coolant vapor coming through the vents

I have a 1999 Dodge Ram 1500 4x4 and everytime we turn on the heater, the trucks cab fills up with, what smells like, coolant vapor (and you can see the "smoke" coming through the vents.) Plus the vapor foggs up the windows and it won't come clean no matter what we wash it with. And to make matters worse, the fan now only works on high. What do I do?

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  • Posted on Jan 17, 2010
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Joined: Jan 04, 2010
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Most likely you have a leaking heater core, or a leak at the hose connection at the heater core. Proliance brand cores run 45-50.00 and the part number is 398313. If you fan only runs on high, the motor resister is probably defective. They cost around 45.00 and the AC Delco part number is C1112. When you are doing your repairs you will probably want to replace the cabin air filter also. The ac delco part number is ACA1166C. These numbers are assuming you have the 318 engine. A good ammonia based window cleaner should do the trick for removing the antifreeze film on the glass. If not, try vinegar- stinks though. Hope this helps. Marvin.

Testimonial: "I appreciate your fast responce. I will definantely have someone check out the things you told me. Thanks again!"

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Related Questions:

0helpful
1answer

Any way to clear an auto heaer core wihout replacement? Replacement costs $1500 - $2000

Replacement of the heater core is not usually necessary unless it is leaking -- you can see or smell coolant inside the cab.
When the engine is running and warmed up, with the heat set for full hot, are both heater hoses hot? If not, you can try back flushing the heater core. There are several good videos on YouTube showing how to do this.
If both hose are hot but no heat, with the controls NOT in the recirculate mode, is there (cold) air movement through the vents inside the cab? If no air movement, your air intake plenum (area under the grill below the wiper blades) may be plugged up, blocking air intake to the blower fan.
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Water evaporation always refilling radiator also when air condition off a vapor comes through the vents

The coolant is not evaporating ,it is leaking from the heater core. The vapor out of your vents is coolant. You probley also have a residue on the inside of your windshield
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Ford f-150 that has smoke coming inside the vents when you drive it.what would cause this? 4.5 v-8

You trucks heater core is leaking inside the dash heating vents, the air blower motor blows through the heater core and then you smell the leaking coolant in the form of a sickly sweet vapor. You will need to replace the header core, this is a fairly big job and in most cases best left to a professional.
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I have a dodge ram 2004 1500. when we turn the AC on, vapor comes out of the front vents and what seems to be antifreeze/coolant scent odor aswell. i noticed vapor on the floor of the passenger side of the...

Sounds like a blown heater core. It's an involved job that requires the dash board to be removed. Not specifically a dealership job but definitely a good shop. Realigning some dashes is a pain in the ****.
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Truck is blowing vapors out of heating vents...fogs inside of truck

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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I have a 1999 dodge ram with a 460. I have very little heat and there is a mist that comes out of the vents when i turn the heater on. I unhooked the heater hoses and ran water through the core and it ran...

The hoses might have a heater control valve on one ofthem,check and see,an you may have to replace it.Also make sure there is enough coolant in the system,it will not flow threw the heater core if there is not enough coolant in the system,the mist could be the hole in the heater core.
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WHITE EXAUST SMOKE WATER VAPORE COMING THROUGH AIR VENT CUTS OUT WHEN DRIVING LIGHT COMES ON AN OF CAR ACTS UP BURNS OIL

Well, this definitely sounds like you have a blown head gasket, and maybe a busted heater core (water vapor out of air vents). Both were probably caused by the car overheating creating a lot of pressure in the cooling system and blowing the head gasket(s) and maybe the heater core. The vapor out of the vents could also be caused by external coolant leakage of the head gasket on the hot engine bringing the vapor inside the cab via the heater fan...

I'd get that checked before any major engine damage happens...
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Water circulation sound

The heater core is restricted you need to replace the heater core
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When heater is on smoke comes out of the vents

If it smells like antifreeze, your probably looking at a new heater core, just make sure you check hoses going into firewall from engine side to make sure it isn't a leak by end of hose, leaking down into that heater core area inside. If your coolant keeps going down, that's more than likely where it's going.Make sure you check coolant level .
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