Question about 2003 GMC Savana

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1997 GMC Savans 35500, Rear Air only warm air

Front Air works fine, took to Sears to check rear air, recharged, told me no leaks, system fine, drove away rear air still blows warm air. Returned following day, they cannot repair rear air (night be clogged line?), They checked the solenoid valve which controlls the vent door position...working fine...they returned monies spent...NOW...Let sit for 4 days, started up van, now front AC Not Working, Compressor turns on for 2-3 secs. and shuts off...Now what?

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Well what I see you have two problems with you A/C ..1- if the compressor is cycling very fast , the system is probably low in freon , this ban takes like 4lb of freon, now, 2-if we have the right amount of freon and the rear A/C don't work and all the vents are working fine back there for sure the problem is the expansion valve located close to the rear evaporator , that valve get stock open allowing to much refridgerant get in to the evaporator and no cooling at all ,in the back,... you can also have a bad low pressure switch located on the accumulator, making the compressor cycling very fast ..the first you have to do is check the pressures if they are OK , change the low pressure switch..then go to the second problem

Posted on Aug 02, 2009

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