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Re: 2001 Ford Focus
Most probably the blower motor resistor.If these become corroded they will cause this problem. Try this first. I'm not sure where it is located on your application.May be under the hood or under the dash.
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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.
Yes, the relay or the fan itself. You have to let the car get hot to test. Please tell me--do you have the ZETEC engine or not? Single overhead cam or dual overhead cam? Also, do you have A/C or not. I will send you the wiring diagram and some troubleshooting steps.
Check the low speed fan connector. It will burn out and the fans will only run when motor is very hot. It is located between the two fans and plugs in to the fan resistor. Unplug it and inspect the connector. You can fix it with two female spade heavy duty connectors. You will see it if you open the hood and look between engine and radiator.
THE BLOWER MOTOR RESISTOR FAULTY IF YOU HAVE ONLY 1 FAN SPEED ALSO AC AND HTR CONTROL SWITCH BAD.WATER LEAK UNDER GLOVE BOX COULD BE THE HEATER CORE LEAKING IF LEAKING ALL THE TIME WHEN THERE IS NO RAIN.
Make sure the fans are running when AC is on. The fans should run all the time and regulate from high to low speed. If it does not run on low speed the connector for the low speed resistor has burned out. It is located between the two cooling fans and has two wires. Mine was burned and I clipped the wires and replaced the connector with two heavy duty female spade connectors. Cost 4.99 . Ac works fine now. If all the fans are operating correctly and ac is cycling on and off it may be low on freon .
Your blower motor resistor has gone bad, it should be located next to your blower motor in the car, held in place with a couple of screws, remove it and replace it. The resistor is responsible for making the blower motor run at slower speeds than high or (4). Let me know if this helps.