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Posted on Jun 30, 2011
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My 1999 Chevrolet Suburban heater and a/c switch not working properly. When I have my fron a/c unit on, it does not blow as cold as the back unit. It feels like it's blowing warm air like if the temperature was turn to the red. Now my back unit does the opposite. It blows very cold but when I turn the temperature to the red, it still blows cold. For the front unit, I changed my Thermonstat, heater control valve, and heater core. The back unit has a new heater core as well. I have refrigerant in both units and anit-freeze and coolant. Also a new radiator. Not understanding why the front unit will not get colder and the back unit will not get hot.

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Greg Lankford

Greg Lankford

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  • Posted on Jun 30, 2011
Greg Lankford
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Joined: Jun 30, 2011
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You are going to need to use a multimeter and have a professional test the relay voltages. This should probably only take an hour, make sure they have the proper electrical schematic for your vehicle year make and model.

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