Does the temperature gauge read normally? If it's too low, suspect a defective thermostat. If it reads normally, feel the two heater hoses after the engine is warmed up. They should be too hot to hold onto for very long. If they're just warm, suspect a plugged heater core. They can usually be back-flushed with a garden hose. If the hoses are hot, suspect a problem with the temperature door or its actuator in the heater box.
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Friday, February 5th, 2010 AT 9:12 PM