01 Aztek hissing under dash

hotnnasty

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Hey All,

Hoping someone can help me out. The wife drives a 2001 Aztek GT. We were driving today with the air on. Then it started making a hissing sound from under the dash, and the air went to blowing warm air. The compressor cycles still, and doesn't seem to short cycle either which makes me think its not low on charge. Every door and flap I've found seems to be operated electrically. But the hissing sound that it makes sounds like a vacuum leak, and it only happens when the a/c switch is on. Any help would be appreciated.
 
your diagnosis sounds correct, either a hose with a leak or a control with an internal leak
 
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