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could be radiator fan switch, to test turn on AC and see if fan comes on, if not locate the relays for the fan and jump them out if fan comes on replace the relay (some models will have multiple relays for three speed engine fan operation. here's a link to help diagnose http://www.aa1car.com/library/electric_cooling_fan.htm
Some cars are designed to allow the fans to run even with the key off until the engine and radiator cool down. If it continues to run after 19-15 minutes you may have a sticking fan relay, usually located in the fuse box in the engine compartment, just replace it and it should take care of your problem
P1491 - Radiator Fan Control Relay Circuit Open Or Shorted
When monitored: with the ignition key on, battery voltage greater than 10.0 volts and the pcm requests the radiator fan to be turned on. Set condition: an open or shorted circuit is detected in the radiator fan relay control circuit.
Possible causes radiator fan ctrl rly circuit wire harn intermittent defect radiator fan ctrl rly circuit wire harn observable defect radiator fan relay ground circuit open rad fan relay control circuit open radiator fan relay control circuit short to ground rad fan control relay defective pcm defective
either the fan is bad or you need a temp. sensor, to check fans, run a wire from positive on fan wires to positive on battery, if need be ground fans!! if they are ok the fan should start running,,
Dodge Caravan is notorious for failure of the electronic cooling fan control module (AKA cooling fan relay). This is not a "relay", it is a solid-state control unit, but many people call it a relay anyway. It is mounted on the inside of the left frame rail just behind the radiator. You have to look up from UNDER the vehicle to see it. It looks like the picture below. The picture shown is very close to actual size.
Check the fluid level in the radiator - after it cools down !
It sounds like you should replace the temperature sensor that controls the fan. This is usually located in the radiator and has electrical wires connected to it. Trace the wires from the radiator fan ( not the air conditioner fan!) to the sensor.
If the radiator is aluminum you may need special anti-freeze to prevent damage.
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