2002 GMC Savana 2500 Front AC warm, rear AC cool/cold
I have an 02 GMC 2500 Van, suddenly, AC turned on, Compressor can be heard running. Front AC is warm air, even on MAX (recirculate), Rear Air is cool to cold. I suspect either a vent is not closing or the front orifice tube has become clogged. Any experience or suggestion before I tear into it.
Thanks in advance
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I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.
the ac compressor is controlled by the thermostat connected to the evaporator under the dash When the cab air temperature reaches the set temperature the ac compressor switches off . IT is called cycling. If it causing a problem with the engine rpms then there is a sensor problem not an ac problem so run the fault codes to determine where it is . ECM's are programmed to maintain constant rpm regardless of the load placed on the engine at idle.
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
you can snug them tighten them by turning the tire as you turn tighten until it feel like you have drag then back off one turn then turn tighten till nut touches then 1/6 tunr put castle nut and cotter pin back on good luck
On most vehicles with front and rear A/C, the two systems are basically independant of each other just sharing the compressor and condensor. It is possible that the Mode Door (controls where the air flow is sent; ie: windshield, vents, floor) is out of adjustment or sticking.