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dave 11/28/2012

2000 Chrysler Grand Voyager SE 6 Cyl 3.0L


Heater only produces heat when over 30mph, idle or stopping makes the heater blow cold air.

120000 miles on van, heater control was replaced used 12 days ago. Thermostat was replaced last year when engine was running close to overheating. The engine runs at normal temperature when warmed up does not overheat. There is a coolant leak which I top off every month. After warming up the heater only blows cold air until the van first accelerates to 30mph roughly. At which time the heater blows warm air. The faster you go the warmer the air. If you were to stop at a light or reduce speed under 30. the heat goes cold.

1 Answer


CVO 11/29/2012

First, repair the leaks, then the heat will be back to normal.

Insufficient coolant , trapped air in the cooling system might not have enough coolant to fully fill the heater core.

The hot coolant flows from the engine to the heater core through the "inlet" hose. After circulating through the core, the coolant returns to the water pump through the "outlet" or "return" hose. Both the inlet and outlet return hoses should feel hot when the engine is at normal operating temperature and the heater is on.

1. If the both heater core hoses were cooled, then this vehicle might have an insufficient coolant in the cooling system.
2. If the heater core inlet hose is hot and the outlet hose is cool, the heater core might be clogged.


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