Question about 1987 Chevrolet Monte Carlo

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Heater won't turn off on a warm day/hot day

During the summer or a warm day (50-60 degrees F), the heater will not respond to the heater controls, however, during the winter, the heater responds as it should. I have no idea what is happening. Can someone help me out?

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There is a vacuum operated water valve on the firewall .. it might be not shuting off completely . You might have to replace this or the switch that shuts off the water to inside or to the heater core thanks Jerry

Posted on Jan 28, 2009

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1 Answer

How do I fix the heat


You have one of two problems. The heater core is plugged /
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Heat (or lack there of)


The heat source for the fan is probably comes from the liquid coolant in the radiator. Since the temp gauge shows it to be warm, my assumption is that there is no hot liquid getting to the heat element in the AC/heat plenum.

Do the controls feel any different than they usually do? I'm assuming you have probably been using the system in the AC mode during the summer. I would try to see what happens when the different heater controls are moved. Somewhere there is a valve that is not being actuated, or a vent door that is not moving. My experience (personal) is that a door that controls air flow is not operating and that's because it has sat in one position all summer. Sorry I can't be more specific.

Hope this helps Good luck Loringh

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Is it leaking antefreeze?
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