a /c will start going to defrost, twist knob few times and it may start working again
Nov 2, 2012 at 4:51 AM
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DRCRANKNWRENCH
CERTIFIED EXPERT
3,380 POSTS
One of the vent doors in the main air box, undr dash in center, has a problem staying shut. You probably have electronic actuators on your car, so it is failing and needs to be replaced.