Question about 2004 Jeep Grand Cherokee
Posted by Anonymous on
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Posted on Jan 02, 2017
It is on the driver fender near air filter housing. Also next to the fuel pump ballast resistor. It is the white 3 inch long piece of ceramic on the fender with eletricial connectors on each end.
Posted on Jul 30, 2008
Have you tested the fan sending unit on the engine? disconnect that and if the fan runs (Key on) that is most likely the problem.
Posted on Oct 17, 2008
You didn’t mention replacing the temperature sensor located
on the block in the path of the ‘cooled’ coolant.
I can’t tell you any closer where to look for it since you didn’t specify which engine you have.
This device is a solid state item called a thermistor.
With the air temperature around 77 degrees F and a 'cold' engine, it should measure about 10,000 Ohms and hot, around 1,200 Ohms while disconnected from its mating connector.
With the ignition on, and the connector disconnected from the sensor, you should measure about 5 volts coming from the ECU.
If this has failed, the ECU is not getting the right info back from the sensor and doesn’t know if the fan is needed or not.
Posted on May 26, 2009
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