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Old 03-27-2011, 07:23 PM   #1
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hot air a/c

My 1999 itasca blows hot air when set on a/c. A short while ago the heater core failed and was replaced-now the a/c doesn't work. When i lift the instrument console I can see a valve that moves when I activate the a/c controls but hot air still comes out the vents. Are there other valves that could be problems and how do I find them?

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Old 03-27-2011, 07:56 PM   #2
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There are also vacuum-operated doors in your dash heating/cooling system. A vacuum leak could cause these "blend doors" to be in the wrong position. I had a vacuum hose just fall off once, so it was a pretty easy fix, good luck, HarveyP

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Old 03-27-2011, 08:03 PM   #3
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Look for the linkage that moves the water valve actuator. When you slide the lever on the dash to cool position, the connecting linkage should close the water valve that allows hot water to the heating coil. Perhaps the link connection was not replaced after the work was done allowing hot water to flow continuously to the coil.
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Old 03-27-2011, 08:04 PM   #4
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You should see the actuators move the damper doors to close off the heater core. Some are cable operated, some are vacuum operated. Hopefully you can have access to all of the controls and dampers.

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