Quote:
Originally Posted by LindquistJon
I had driven my Tahoe about thirty miles and the air was working great, got home and parked it and heard a hissing noise coming from under the hood. I determined that it was coming from the passenger side. Today went to drive it and the ac was not blowing cold air, any ideas?
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there is a high pressure release valve for dumping pressures if too high could be it got stuck open. check for leaks use the UV dye in the R134 charging cans .
sometimes on shutdown it will hiss. high side pressure goes into the low side to equalize the system.