Question about 2000 Chevrolet Silverado 1500

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2000 Silverado Z71. Heater stays in hot mode.

No matter what position the switch is in. I live in South Texas, so this is a real problem as we don't need heat all the time.

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There are a couple of things you can check, or have checked. Under the dash, behind or around the ac duct work, there is vacuum operated actuator valves, which open and close different doors to direct heat or cool air,one of them might be stuck in the heat position.But the first thing to check, if the truck is equiped with it, is the heater control valve, it is under hood passenger side connected to one of the heater hoses going into firewall.Move the lever in opposit position, if you get cool air,thats the problem.If it's vacuum operated,check for leak,if no leak,replace valve.

Posted on Jan 22, 2009


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