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The heater fan squeals when turned on - 2005 Toyota Corolla

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Sounds like leaves or trash in the blower box. You will have to pull it and clean it out.

Posted on Jan 14, 2011

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Posted on Jan 02, 2017

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1 Answer

Blower fan makes a high pitch squeal.Replaced fan but squeal is still there.


'high pitched squeal' sounds like the serpentine belt on the water pump, not the heater fan.

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The speeds are controlled by a resistor pack. Changing the resistor pack may restore full functionality. Volvo heater fans are notorious for squealing. Usually they are run at a speed that doesn't squeal. If it squeals at one speed, sometimes a different speed won't squeal. The resistors seem to eventually fail. They are fairly cheap to replace.

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Possible that the fan belt is not tensioned right or that the water pump is binding causing low flow through the heater.
If belt is not loose, release it more and try turning the water pump by hand to see if it is binding.

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Toyota Tercel belts are squealing


I have been having the same problem with the alternator belt squealing, most noticeably, when using the heater fan , accelerating, turning the headlights on. I have a 1997 Toyota Tercel CE 1.5L 4cyl with no A/C. I just tightened the belt tight enough that there is no give to the belt and it does not squeal anymore.

I also used a Goodyear Gatorback from Napa belt which seems to be nice and quiet when tight enough.
toyota-tercel-belts-squealing-ty2scxoafj3l5g41anllvv1v-4-2.jpg

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hi this may be the bearings in your heater fan gone u/s and possibly dry unfortunately the only answer to this is replace the fan ...hope this helped

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1 Answer

Heater fan only works on high after replacement of heater core


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's probably the humming noise your hearing.
Good observation by the way.
Let me know.
regards,

Feb 13, 2009 | 2001 Chevrolet Prizm

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