Hi ,, I am having a problem , when I switch the AC to max, I can hear the air, but nothing is coming through the vents...is there an in cabin filter??? where is the durn thing, I have looked and can't locate it. My truck is a 1999 model , I bought it new and we have covered 340k miles , with this heat, it sure would be nice to get that going again. Thanks !
Dixie Rose

 

Does the air come out of the defroster when placed on the max setting? if so, there is a vacuum leak in the system, probably close to the max air actuator. I don't think yours has a cabin air filter.