Question about 2003 Chevrolet Malibu
Thermostats rarely fail open.
Does the radiator have plenty of coolant?
Check the valve that controls water flow to the heater core. You can usually go to your local repository library, and they will have factory service and repair manuals (Not Chilton's or Motor's, but by the factory) for your specific vehicle, including troubleshooting charts and repair methods.
Posted on Jan 16, 2009
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