Squeeling noise coming from AC, compressor is on, fan not turning
I also noticed a loud squeeling sound coming from the AC unit when the AC was running yesterday. Not sure when it started but had turned it on about 1 hour before i heard the noise. Never heard that noise before. I also turned the AC off because it sound like something was wrong. Now, when I turn the AC on I can hear what sounds like the compressor running but fan is not spinning and then the squeeling sound starts. While off, i can spin the fan. If it's a capacitor problem where is it located and is it and easy inexpensive fix. I also reset the circuit breakers and they didn't fix the problem. Any other help would be appreciated. Thanks
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Re: Squeeling noise coming from AC, compressor is on, fan...
The squealing noise is coming from the compressor. This noise is common when the unit reaches extreamly high pressures. The pressure is most likely high because the fan is not running. Since you can spin the motor it could be that the motor has damaged windings. Leave the unit off until the repairs are made to ensure no further damage to the compressor. You will need a multi meter and some experience reading wiring diagrams to properly diagnose the system. You can perform an amp draw on the motor to see if it is in spec. You can measure the volts to the motor and see if they are in spec. Finally the contactor can be measured with the proper meter to see if it is working properly.
My suggestion is to have the Motor and capacitor both replaced. Also inspect the wiring in the condenser electrical compartment for any signs of damage or burning.
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OK, you will need to replace this compressor. the internal seals have ruptured, causing the loud noises. the heat is from the metal to metal friction. the compressor can be rebuilt but, it will be more costly than just replacing it with a new compressor.
This could be the evaporator/condenser fan blades striking the housing or it could be the compressor.
Turn the unit to "fan only" and see if it makes the sound you describe. If so, there is an issue with the fan. You may need to remove the outer cover and see why the fan is making noise. Look for debris, or insect nests that may have taken up residence. If no obstructions, look for bent, cracked or broken blades and possibly loose blades. Make sure the A/C unit is unplugged before working on it.
If no noise in the fan mode, turn the selector switch to cool, being sure that the thermostat is set low enough for the unit to try and cool. If the sound is emanating from the compressor, there isn't much that can be done in terms of repair and it may be time to replace the A/C unit. Compressors aren't usually worth the cost of repairs.
Sounds like a bad fan motor. Inside fan runs, compressor runs. Outside fan. Are your contactors pulled in when thermostat set on cool? If not might be a contactor. If contactor not pulled in touch the top of it with the end of a screwdriver. If fan spins turn unit off a buy a contactor...
Have someone check the run capacitor of this unit. If the run capacitor is bad over shorted it can cause the unit to run and short cycle on a current overdraw. This makes for an electrical imbalance in the compressor motor. Next step is the compressor is faulty.
Is it installed in a window? Check to make sure it is installed correctly. usually there is a felt or foam strip that is used to dampen vibration when you place it in the window. It also acts as seal to keep outside air and bugs out. If you place your hand at various locations on the unit does the sound go away? If it does then you know it is a vibration problem. Just add new foam or re-adjust the foam or gasketing it already has.
If that doesn't work then try to locate the source of the noise. Use a mechanics stethoscope or even a cardboard tube from paper towels will work. Once you have located the source then you can tell the store what the problem is when you take it back and get a new one.
Cheap air conditioners are noisy. Some more than others, it's why they are cheap. But your problem does sound like it could be a product issue.