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I would have to ask exactly what you're smelling. If it's exhaust, you have an exhaust leak somewhere where it's able to get into the HVAC ducts - exhaust manifolds are a likely culprit here. You'll need to repair the leak.

If it's electrical, your blow motor is probably burning out. You'll have to replace it.

If it's a moldy smell, you have mold on the evaporator and/or in the ductwork. Get some anti-mold spray. Run your vehicle with the AC on high (but NOT on Max AC - you need fresh air intake), spray it into the intake ducts underneath the wipers, and run the AC for ten minutes afterwards. For the evaporator, get some of the foaming anti-mold spray, and spray it into the vent by the passenger door. Repeat as needed until the smell goes away. To help prevent it from happening again, make sure you shut your AC off a few minutes before you shut your vehicle down.

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Q: When air conditioner is turned on I can smells fumes inside cab when idling in my1994 ford 250?
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