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Cat Diesel, I thought about the cabin filter too, But GM didn't put them in the pickups until 99. Cleaning he condensor is also a good Idea although it won't effect air flow I would clean it anyways. The evaporator can't be cleaned without tearing the dash apart because that is inside the duct work.It is good advise to check to see if all the settings work properly to eliminate a stuck door or bad motor and I think if they work properly his problem is most likely the evap fins pluggeg. Do you agree ??
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