My a/c , on max air will quit blowing thru dash vents and blow thru defrost vents then switch back and forth intermittedly. On normal a/c the air blow thru dash vents all the time. However if the vehical is stopped in traffic the air will get warm. When moving along, it will cool down again. It does not get as cold as it used to with problem. I had feron pressure checked and the pressures were normal. I have this same problem with a 96 windstar van. The problem started in both vehicals about the same time..My niece is having the same problem with a 97 gmc jimmy...I spoke to a person havinf their ltd serviced at the dealership and they were having the same problem and the dealer had not been able to pinpoint the problem. Does any one know the solution????help!!!.......richard in south carolina..
rka2842@aol.com.........thanks for any help.