Question about 2003 Mercury Grand Marquis
Once the engine is warm, the radiator fans runs constantly, even when outside temp is in the 40's. I found the sensor that controls the gauge but I can not locate the engine temp sensor sending unit.
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Posted on Jan 02, 2017
SOURCE: Hi: I read your answer to
Very correct the ECT is a 2 wire thermistor,when coolant temp increases, the resistance andsignal voltage decrease,If you disconnect the sensor the fan goes on, you just trouble shooted the vehicle cooling fan switch, If anything the signal to the gauge itself may be non-op and not getting to the indicator, try this with vehicle at warm up temperature if you turn the A/C does the fan turn on.it should if it doesnt the power juction box (fuse and relay in engine compartment should be checked, for any opeen fuses, By the way the guage information is from the PCM
Posted on May 04, 2011
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