The problem is most likely with the mode door. This door is under vacuum control and what you are probably seeing is a vacuum leak. It sounds dumb, but most of the time you can find the problem by inspecting the lines under the hood or listening for a hissing noise when the engine is running and following it to the leak. Beyond that, you will need a handheld vacuum pump/gauge to check the system and follow the lines to a leak. You can get the pump for around 30 bucks, or just borrow one from any of the big auto parts stores under their tool loan program. Feel free to follow my user name to my Bio Page and a link to the HeaterTreater web site if you need more info. ford4me.
It is for filtering the air going through the heater/ac system.
A leaky heater core can do that. Also if the AC is not operative, the defrost mode can't dry the cabin air.
heater core may be partly plugged .
Over time debris and other things can collect near the heater core, its possible that something small and plastic has fallen down through the defrost vents and gets hot when the vehicle is running. You may need to disassemble the heater and remove the items and perhaps vacuum it out.
NO It has NOTHING to do with defrost.
No , there isn't a cabin air filter on a 1996 Ford Explorer ( from the factory )
Ford Explorer 2004 does not have Cabin Air Filter or A/C filter.
Where is the cabin filter located on an Ford Explorer Sport Trac 2008?
The 2003 Ford Explorer cabin air filter can be found behind the dashboard, on the passenger side. The cabin air filter should be labeled as such.
No.
Most people when they say "air filter" are referring to the engine air filter. Cabin air filter cleans the air that comes into the car, goes through the heater core or air conditioner and then out through the vents into the cabin of the car.
The 2005 Ford Explorer is not equipped with a cabin air filter. Both engines between the 4.0 and 4.6L do not list part numbers for cabin air filters.