Mechanics

HEATER NOT WORKING

2000 Chrysler Town and Country

Heater problem
2000 Chrysler Town and Country 6 cyl All Wheel Drive Automatic 150000 miles

Heater problem
2001 Chrysler Town and Country 6 cyl Front Wheel Drive Automatic 120, 00 miles

At first the heater in the van would only blow warm air if the van was in gear and going down the road. Now it blows only cold air. Coolant level is fine. No visible leaks. Why wont the heater work?
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Gishroy
November 16, 2009.



First look at the temperature gauge on the dash when the engine is warmed up. If it's lower than normal, suspect a defective thermostat that is opening too soon and preventing the engine from reaching normal temperature.

If the gauge reads normal, feel the two heater hoses after the engine is warmed up and " heat" is selected. If they feel cool, suspect a plugged heater core. This used to be common on older Caravans. Sediment would collect in the heater core because it sits so much higher than the engine. I've had very good luck on those older models with removing the heater hoses and flushing the heater core with a garden hose.

If the heater hoses are hot, there is a problem with the electronic controller, a broken door in the heater box, or a problem with the vacuum hose or motors that run the doors. Based on your dandy observation that it blew warm air for a while, I'm leaning toward a plugged heater core that was partially plugged earlier. Actuators and temperature doors in the heater box generally fail suddenly, and all at once.

If the problem gets worse, to the point of engine overheating, suspect a worn / loose / broken impeller on the water pump. I haven't heard of this happening on Chrysler products but it's very common on Volkswagens, so it's worth mentioning.

Caradiodoc

Caradiodoc
Nov 17, 2009.