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1994 Mercury Capri ac does not have a cabin air filter. Weak air flow and bad smell could be debris in the fresh air/ac inputs. Check under the hood for debris where the air enters, the area under the wiper, and behind the vents inside, they get clogged if you park under a shedding tree...Chris
Depending on the year it may have a filter. i would check and replace it, another thing ive found on many cars is that mice make nests on top of the filter for the heating/ac system and that smells bad, what i do is replace the filter and then turn on the ac or heat at low temp with high speed fan and make sure the setting is for outside air not recirculating and then spray grem and ordor killing spray into the vents, not inside the car but from the outside where the wipers are, this is where the air comes in from and also make sure to open door to allow the spray to exit the car, good day.
mildew in ducts or evaperator. Mist a small amount of diluted bleach in there from the outside while its running and run until you think its dry. They sell a similiar product/service at the dealership. There are drains in the ducting that might be clogged and a filter that can be changed, Get a charcoal filter if available.
This is not good. Your problem is worse than the Squirrels that put Walnuts in my A/C ducts and shorted my controls. The critters can chew holes in the plastic vent covers to gain access.
Your critters could have pooped and peeed in your Ductwork. This may be covered by your Comprehensive Insurance as it is a Health Hazard. Call your Agent, really, call your Agent.
I believe your Series of vehicle has an In-cabin Airfilter. This may help. Ford does carry products to Sterilize the A/C ducts which will help. Although the products were intended for Mold and things growing in the Ducts.
A dead Chipmunk is a possibility. So is a cooked animal on the motor. Good luck on this, about all you can do is change the Incabin filter and decontaminate. A Dealer can take apart the ductwork and get to th heart of the matter.
you can buy a deoderiser that kills all known airborn nasties,you spray it into the air inlet of any aircon unit,the only smell that it will NOT get rid of is cigarette smoke.that sticks to the filter/condenser and all the vents...nasty.
could be an a/c leak, could be mold in the vents.....there are vent cleaning kits you can get at most auto parts stores....they consist of a spray that kills mold, however you do not want to use them if you dont know how to take the ductwork out of the dash as it may leak and destroy electrical components in the dash.
You might have both. The fresh air intake is under the windshield wipers, that vent takes in the fresh air from outside. The filter is usually in the rear seat section on vans and suvs, somewhere, sometimes up front under the dash. You can switch your ac or fresh air control to recirculate and it will cut off the outside air. We always do it on dusty roads and dead skunks. Hope this helps.
If you have petrol smelling inside the car you probably have an open area of the car's body that permits outside air to enter. is the smell greater in the front or back? This is not easy to fix as you have to locate exactly from where the leak comes from by smelling and following to the source. In the engine compartment there is a small filter that vents fumes from the tank to prevent explosion of the tank due to increase in pressure as the car moves. At the tank section that might be a broken vent hose.
If you run your Air cond on recirculate always try using an air sanitizer in your return vent. Or switch your A/C to outside air flow for for half an hour and raise the rear of your sunroof panel to vent the stale air do this till the smell dissipates and then close he sunroof and reset the A/C to recirculate if desired.