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Why is the heater getting warm and not hot? - 1999 Dodge Caravan

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Could be the thermostat, low on coolant, a blockage in the heater core, or a faulty blend door under the dash.

Posted on Dec 11, 2012

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Heater core not getting hot means it is clogged. Under the hood at the fire wall check the heater hoses when the engine is hot and running. If one is hot and the other is warm, replace the heater core. If both feel like the same temperature. Look to replacing the blend door. At operating temperature, you will not hold those hoses to long. If both are just warm to kind of hot, look to the water pump or thermostat.

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If all THAT seems to pass (heater valve definitely open) an d still low or not heat inside and both hoses the same, your water pump may not be making enough flow to feed the engine and the heater. Typically if this is the problem, holding the engineat high rev (3000+) for 5-10 minutes will cause the heater to warm up mostly, and then dropping the RPM to 1000 or 1500 you will feel it cool off rapidly. If that is the case, you will need cooling system repairs.

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If they are not HOT, then check radiator hoses for proper heat. If radiator hoses are not HOT then thermostat is stuck OPEN.

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