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You could be low on fluid. So open the engine compartment and check the radiator for full water first. If this is OK the valve which opens the water supply may be bad. Check the connections in the engine compartment. They are on the fire wall behind the engine. Check to see if they are opening and closing the valve when you move the temp lever from cold to hot. If it is and the hoses stay cold when you heat up the motor I suspect the heater core is clogged and needs to be replaced.
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if this system uses dex-cool flush the system
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