Hi:
I read your answer to the problem with the 1999 Mercury Mistique temperature gauge. I'm having a similar problem.
My temperature gauge is broken in the cold position. And, as far as I can tell,...
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
ok and the wires th the fan and the sensors, if they had power to ht fan but if it doesnt work. if i put a test lite on the plug would the lite shine? because i did this and it didnt shine.
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