Question about 2001 Ford Focus
Hello, on your model the Head sensor sends a signal thru a resistor pak and the ECU. If the fan runs on high speed when you turn on the A/C then the resistor pak is good. If the resistor pak is bad neither of the fans will run when the A/C is on. Change the resistor pak.
If the fan runs on high with the A/C on, then the head sensor is not indicating a high temperature condition when the A/C is off. The A/C switch overides the head sensor. The head sensor is on the Passengers' side of the car above the Alternator. The head sensor is not throwing a signal to start the High speed fan. The head sensor is a long pin screwed into the head at that location.
While you say the fan is working, it may not be working well enough because of the head sensor.
Posted on Mar 13, 2011
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Posted on Jan 02, 2017
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