I have Uplander 2007 , all of the sudden have hot air coming out from A/C in front and back. Checking in the workshop , they suggested a leak for freon , it wasn't found at all where the leak is. They checked rear evaporator , front evaporator , condinsor and all other necessary parts , but couldn't find where is the freon leak. The leak is very fast , just gone in less of 2 hours after recharging. Any suggestion please !!!!
That is a very fast leak. try using UV dye leak detector. color of this dye is bright green and will be show at the leak source. a UV light is also helpful so you can see it better. you can buy this at any auto parts with freon mixed with it, with this leak you should see oily trace at the leak area, don't forget to recharge compressor oil after your repair.
SOURCE: Air conditioning not working. Blowing cool air in the back and hot air in the front.
Is there air blowing from the front vents? or can you hear the vacumm change when you change it from heat to cool..... I think it might be a vacumm problem... its a 1997 so the controller vacumm hoses may be cracking.. let us know
SOURCE: I HAVE A 2001 CHEVY TAHOE FRONT AC BLOWS COLD REAR DOESNT
I would agree it might be the valve.
One line should be cold and the other warm or hot.
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