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04:01:29 - 12/24/2024
V8 Dakotas
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BigDs02Dak
Dodge Dakota
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10/22/2004
19:57:22
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 Subject: Exhaust Smell through vents...
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Has anyone else had this problem? Lately in cold weather there is a exhaust smell that is comming from the vents. This happens when I leave then vents on (as I always have them on) when I first start the truck. I took it into the dealer and they said that there is nothing wrong and they couldn't duplicate the problem. I know that I'm not imagining it since friends have smelled it. I am thinking that this is a problem with the exhaust manifolds, like they are not sealing correctly when cold and once they are warm and the metal has expanded they seal fine. Anyone have any ideas on this?
Any replies would be appreciated. Thanks.
2002 4.7L CC SLT Plus
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Joey
Dodge Dakota
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10/22/2004
20:31:53
|  RE: Exhaust Smell through vents...
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this happened to me too. but the reason was because when the little hose that goes from the valve cover to the air hat broke, i just put a mini-air filter on the valve cover and blocked off the air hat hole. now some fumes sometimes come out of the little airfilter and make it into the truck when i use the vents. but it never did that before i did this small modification.
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SR
Dodge Dakota
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10/22/2004
20:37:55
| RE: Exhaust Smell through vents...
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(Damn, I just wrote a long answer to this, then accidentally shut my browser down before posting it...)
Despite what you think you're smelling, I seriously doubt that you have exhaust gases coming out of your vents. First of all, the heat source is the engine's coolant, and the air is drawn either from outside (from the windshield cowling under the wiper arms, I believe) or from the inside, under the middle of the dash. Things to check:
1. To verify your exhaust manifold theory, open the hood at startup and try looking/feeling around for exhaust leaks.
2. How confident are you in the "exhaust smell" diagnosis? Most exhaust gases (carbon monoxide, carbon dioxide, nitrogen, etc.) are odorless. Any chance the smell might be coolant instead? Feel around under the passenger-side dash for any wetness in the carpet, and monitor the coolant level in the overflow bottle attached to the radiator. You MIGHT have a leaking heater core.
3. Try shifting your ventillation selector to a recirculate mode, so that it takes air from inside the truck, and not outside, and see if that solves the problem.
4. There might be some kind of contamination in your ductwork. Try spraying copious amounts of disinfectant (like Lysol) into all the vents, and vent air intakes (under the dash, and outside the cab if you can find it). See if this gets rid of the problem. Also make sure there's no standing water at the outside intake (under the windshield cowling, I believe).
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