Question about 1980 Chevrolet Corvette

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My fan is squealing when I turn on the A/C. I'm trying to figure out how to change out the fan motor as painless as possible

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Before you go too deep into the pump try making sure that the belt is under the correct tension or if the surface of the belt is so smooth it cannot grip correctly

A quick test is to use some belt conditioner on the surface you can buy it from Brammer

Posted on Jun 17, 2009

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Posted on Jan 02, 2017

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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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The blower motor is a sealed motor you can't oil the bearings you need to replace the motor

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Almost no air comes from the ac vents but fan is on high. This happens on auto and also on econ.


The 1992 was prior to Buick putting cabin air filters in so there is not a possibility it is clogged. So more than likely your blower motor is going bad or your fan control switch is bad. Does this problem occur with heating as well as AC? Does it change if you switch between blowing on floor, face, window(defrost) If it doesnt change based on location of blow and type of air temp then I would start by turning fan on high and placing head (ear ) against dash in center of console area. Have someone turn fan knob from low to high with engine OFF...After goign from low to high and back a few times you can see if the blower motor is responding to signal from switch. Listen for a whine, squeal, rattle, or humm. A whine or Humm would indicate a bad blower motor... Squeal or rattle a bad squirrel cage/fan blower blades. If you hear no noise and no perceivable change in blower speed/noise then its possible your switch is bad. Unfortunately the only way to definitely diagnose either is to pull the switch from dash and use multimeter to test for voltage change and for blower motor to pull dash. There is a digital control unit for your car as well. Although rare sometimes the wires on this can loosen or it can go bad. But since you didnt state teh fan wasnt working at all and you are getting cool air, that woudl be teh last thing to check

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Heater fan not working checked all fuses ok.


If you said you have checked all fuses then you go to the fan motor electrical connector and test for power there when the vehicle is running and you have the sitch turned on..If you have power there then it's time to replace that motor....quick, easy, and painless, get back to me if ya have any questions...THX!!! JAY

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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.
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Belts stretch from new. Try to tighten them again. Hopefully the are not glazed or this may stay with you.

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