SOURCE: Heater only works when I'm moving.
check the engine coolant level, if it is low check for leaks, also see if the coolant is dirty or rusty.
SOURCE: heater fan regulation
2002 Grand Caravan. The rear heater also has a resistor for the fan speed control.(3 speed) It is located under the rear passenger side plastic cover. You can take off the rear tail gate lower plastic piece and this will let you pull out the side panel. You can reach in and take out the two screws that hold in the resistor and unhook the wiring adapter. You do not have to take off the whole side panel as you can reach in from the back. The resistor unit can be bought at you local dodge dealer.
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