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Locate hoses under hood that go to the heater core. there should be 2. They are rubber hoses, smaller than the radiator hoses. after you have located them, leave hood open, start the car. Feel the hoses as the car warms up, one hose is an inlet to the heater core, one hose is an outlet. if one hose gets hot and the other does not, then the heater core is restricted, and may need replaced or flushed.
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