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My AC and Heater squeal when I turn the fan on, all belts checked out fine. There is no squeal when I have the knob in the off position, only when I turn it on, for both ac and heater.
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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.
Year make and model ?? The belt could be glazed and slipping even if it is tight. You could have a weak belt tensioner too. The noise when the ac or heat is turned on can be the extra load from the ac compressor or the alternator. The compressor cycles on and off especially in defrost mode. The load from the alternator is the first noise of the day. As the belt warms up it becomes better at handling the load of the accessories. Even tho the belt looks fine, you may have to replace it to get rid of the noise.
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.
probably the blend door not opening fully. Do you hear a clicking under the dash by passenger's feet? If not, try calibrating the system:
Place the ignition switch to the OFF position.
With the Mode knob in the PANEL position, press and hold the AC button for 5 seconds.
Rotate the Mode knob fully counterclockwise.
Rotate the Mode knob fully clockwise.
Rotate the Mode knob fully counterclockwise.
Release the AC button.
Wait 40 seconds for the HVAC control module to self-calibrate.
Start the vehicle.
If this doesn't work, your actuator may have failed. Look under the dash to see if any of the actuators on the heater box are trying to turn when you change the temperature setting. Unfortunately, I cannot find aftermarket parts for your heater, so if the door isn't working you may need to go to the pontiac dealer. Let me know if you have questions.
this is because your bearing in the heater motor is going out. if this is driving you nuts then you will have to replace the blower
hope this helps you
Sounds like the fan control knob has shorted out. You can check the fan "blower" relay and fuse in the engine compartment but you need to make sure the control knob is good or you will keep blowing fuses and relays. If your blower fuse and relay are good, then just have the control knob checked and replaced if needed.
If the noise going away every time u turning off the ac it's probably your ac compressor belt.however i will suggest to take some vaseline and rub it all over the exposed parts of your drive belt.
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