there is a plastic manifold with a vacuum pot on the passenger side of the engine, just follow all 4 hoses, you will find it. mine would not close enough to work, bought an aftermarket (unbelievable that I could not just buy the vacuum pot) unit, hooked up all the hoses, and all was perfect again.
96 Explorer XLT 4WD, 4 door.
>I have read a post before about my problem but I'm going to ask again
>anyway just to be clear and current about this.
>In the winter when I run the heat everything works fine but if I turn
>the switch control to just vent air, not heat or AC, I still get only >heated air.
>Now summer time I need to run the AC, when I run the AC on normal AC
>(not max air) I get the same result, hot air. BUT, if I run the MAX AIR
>it seems to work ok.
>I have read about the vacuum switch behind the glove box, I found it and
>it seems to be working fine, doesn't seem to be sticking, assuming it
>only has two positions.
>I have also read about the heat/cool knob that controls the mixture of
>heat and cool air. I have found and removed it to check it. If I
>remember correctly, it's a standard type of potentiometer and I think I
>should get a reading between the outside terminals, numbers 1 and 3. I
>get no reading there but I do get a reading between 1 and 2, but again
>no reading between 2 and 3, no matter the position of the knob. I
>turned it both ways and checked all terminal combination.
>Could this be the problem? A bad temp. control?
>Any other ideas?
>thanks for any help.
>