1. Could be a caught foreign object between A/C (air conditioning) fan and cooling radiator, producing this loud noise.
2. Could be a damaged fan blade, mowing the cooling radiator.
3. Could be a loud noise comming from the fan's electrical motor.
4. Could be a broken off fin (small wing) of the cooling radiator, striking the A/C fan, producing this loud noise.
SOURCE: air conditioner and heater makes loud noise when turned on.
This might be the noise problem in your blower.The blower is out of balance with this added weight.
SOURCE: AIR CONDITIONER QUIT WORKING
I think the fan belt has got loosened. Tighten it. If loosening is not the problem, then the fan is stiffened up. Oil or grease the fan Bearing. Thank you.
SOURCE: My air conditioner in my 1999 vw beetle stopped
the compressor clutsh is gone , you will need a new compressor
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