The fan motor is running at high speed no matter where I set it...Off, 1, 2, 3, 4, or 5. It doesn't even quit if I turn off the ignition! It's out in the garage right now with no key in it, everything else is shut down, but the fan is going full blast. I expect a dead battery by morning.
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I would start with the rear blower motor resistor, the resistor is what controls the speed of the fan, the resistor is located in the rear heater box near the blower, you will need to remove the right rear side panel to access the heater box. start with that
Check to see if you are getting voltage to the blower motor if you are the motor is bad if not check the fan speed switch. 1 2 3 or low medium high if you get voltage going to the switch but not from replace the switch if you have voltage from switch check the blower motor resistor the although with the blower resistor you commonly have a high fan speed in the max setting and the lower speed settings don't work wich would make you think 1 2 3 are not working but 4 is. That is why it is best to check all parts to make sure the part you do replace needed to be replaced
Three possible causes: (1) The high speed circuit in the radiator fan motor could be defective. (2) The high speed fan relay Could be defective. (3) It possibly may have a wiring issue. I've seen at times where you can wiggle the fan motor connector that's mounted on the fan shroud and the motor will kick on. If this is the case then replace the hole assembly which is a motor and shroud assembly. Hope this helps and have an awesome day.
Good Evening, If I am translating this properly your fan only works on the high setting? And the other settings do not change the speed? If this is correct respond back and I will help as much as possible.
The fan motors use a set of resistors to control fan speed. The lower speeds generate more heat in the resistors and these tend to burn out. While it is possible the switch could be the issue, I would start with the resistors. It is usually a module located somewhere near the blower motor.
Note: One of the reasons these go out, is that with time the bearings on the blower motor go bad and the motor takes more power to run. If the replaced resistors fixes the problem, but then fail too soon, look at replacing the blower motor as well.
if you have checked the switch as recommended, it is most likely to be the heater resistor which contols the diffrerent speeds. it is
normally fited near to the motor and is a squarish block with multiplug on it and coils like springs in the centre of it, look at the coils they may be burnt out.hope this helps
It's very possible the fan motor has quit. The squealing noise is caused from motor bearing failure. As the bearings wear out or dry up the motor is harder to turn and require more current to run the motor. On lower speeds, the motor runs off a series of resistors that reduce the amount of voltage and current so the fan runs a lower speeds. If the bearings are worn, there is not enough voltage or current to turn the motor and that'sprobably the humming noise your hearing.
Good observation by the way.
Let me know.
so your fan stopped working on all settings but high....? sounds like a bad switch...i know alot of jeeps and fords have that problem....lemme know....might hafat add another car to the broken fan switch list....lol