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Old 05-30-2014, 04:13 PM   #5
davischevy
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Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,881
Re: heater out of wack

On the right inner fender, there is a valve in the heater hose with a little vacuum line running to it. When you turn on the AC the vacuum from the control panel closes the flow of hot water.

I would first pull vacuum on the valve. If it holds, you are losing vacuum somewhere between the control panel and the valve. You will have to pull the glove box, and check the vacuum line behind it.
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