Question about 2004 Chevrolet Suburban

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AC problem dual climate controll 2004 suburban set to auto blows cold air in back but front is warm and sometimes blows hot air

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Do you own a set of pressure gauges for R-134a? If not, you can't do much except make sure there is air flow out of rear unit. My guess is there is low refrigerant in system. You can't tell unless you evacuate it and see how much comes out. The new machines will pull it out and weigh it.

Go to any shop, bought a 22oz can of R134 freon with oil and sealant in it. Turned on the Suburban, put the A/C in max high, heard the A/C clutch engage, disengage, engage, disengage, a sure sign that the freon is low. You had two ports to choose from, only one is small enough for the coupler to snap over. You need blew some freon through the hose as and connected it to push any air in the hose out. Squirted freon into the system until the A/C compressor quit clicking on and off. Then you continued to squirt until the pressure was in the low range on the gage for the given outside air temperature. The instructions for this are right on the can, it is a no brainer to do this; you used almost the whole can. Towards the end of the recharge the cheap hose connection started to leak, so disconnected. But it was a good enough recharge that the Suburban has cold air in front and in the rear.

The only other explanation I can imagine is that he actuator won't move fully into the proper position and the fact that the air speed is lower on 1, it doesn't generate enough air pressure to pass the actuator.

Hope helps.


Posted on Aug 04, 2010

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Posted on Jan 02, 2017

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