Question about 2003 Cadillac CTS

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No hot air is thrown out when heater is on. Air caonditioner works fine though. Could it be the thermostat? or do I replace the controle panel?

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Thermostat, is check engine light on?

Posted on Feb 03, 2010

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Could just be the vacuum controlled valve or vacuum lie on hose to the heater core.

Posted on Sep 11, 2009

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Used to be vacuum controlled, but now the doors inside the heater/AC suitcase (housing under the dash for the heater and a/c unit) are electrical rheostat controlled, and tend to give problems. These rheostats open and close the doors used to control where hot air and cold air is tunneled to the dash vents. (the hot to cold dial on the dash is a rheostat which controls an electric motor connected to a door, which opens for hot air, and closes for cold air). The rheostat or motor, it controls, has gone bad. Find an independent garage that you like, (NOT the stealership) and the price to fix will be a lot cheaper and more reliable. Good Luck

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