Question about 2005 Dodge Caravan
Checked for 12volts at the fan when engine temp was at 3quaters, no 12 volt signal. got an engine code for no 1 fan circuit, checked the fuse 40 amp good.....fans are not seized....Thankyou William...
Chrysler to test find the ect....electronic cooling temperatute sensor a two wire sensor neer thermastat housing.. unplug it and with in a couple seconds fan should come on if they do replace sensor oem only.. if still not come on do they come on when ac on.... big problems with pcm....power train control module... main computer.. but cost alot of money so need to be sure......color of wires to ect are dark blue with dark green stripe second wire is violet with orange stripe....get back if not fix for more info
Posted on Sep 04, 2009
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Posted on Jan 02, 2017
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Unplug the coolant temperature sensor while the engine is running. This should cause the fans to turn on low then kick to high, IIRC.
Typically when the engine computer loses the signal from the coolant temp sensor, it just turns both fans on high so the engine will not overheat. Ultimately, the fan is controlled by the computer. When it receives a signal from the temp sensor that reads the appropriate temp, it turns the fan on. One easy option is to wire a switch to the cooling fan relay. Then you can turn it on and off when you need it. I would not recommend running the fan constantly. You will burn out the fan motor and you'll never get up to normal temp for your sensors.
Check for coolant level and bad motor.
However as far as the fans and "disconnecting them from the temp sensor"..... The fans DO NOT connect directly to the temp sensor. They connect to the PCM (computer). The PCM reads the coolant temp sensor, and determines when to turn on the fans. It also uses the coolant temperature to control several other functions, including the transition from "open loop" A/F ratio control to "closed loop" A/F ratio control. It uses the temp to set the idle speed on cold start. It uses the temp to determine the cold start fuel enrichment. If you run this way, your car will be hard to start, it will run excessively rich, wasting fuel, and possibly even damaging the engine by diluting the oil.
Please get back to us if you have further query or else please accept this "particular" solution.
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