1996 AC troubles....forced air fades slowly from vents

[72freak]

1996 C3500. I'm guessing a blend door thing or shorting out switch but here are the symptoms.

AC comes on and blows cold. Blows freely out of the vents. 5 or 10 minuets in you start to feel warm and realize no more air is coming out. You can hear the blower pushing air but its not exiting anywhere. Not from feet area or defrost or vents. The air is trapped and you can feel the cold air escaping somewhere barely. If you turn the switch off and wait a few minutes and then turn it back on it will blow great out of the vents as it should and then it slowly fades again.

The system is fully charged, AC is blowing cold, fan speeds are working and compressor is staying on.

Anyone who has experienced this what is the problem? THANKS!


Before I get asked...and it will happen...yes, the air pressure in my tires is full, my flux capacitor has been replaced, my headlight solenoid is good and my rocker arms do not need adjusting. LOL