The belt either needs replacing, is loose or is dirty/glazed.
If it is dirty/glazed, spray it with belt dressing.
If loose, tighten it.
If i can't be tightened replace it.
Worn serpentine belt and/or belt tensioner.
your ac compressor could be seizing up. happened on my 2003 suburban.
Have you checked the belts? A squealing sound can indicate a loose or worn belt, or slippage of one. If it is a "whine" it is probably the compressor, which could run for a long time or it could give out tomorrow.
Yes, if the compressor's bearings are bad, usually accompanied by a roaring or squealing noise coming from the compressor's pulley.
The loud noise from the AC when turning off is often caused by the sudden release of built-up pressure in the system as the compressor shuts down. This pressure release can create a loud "whooshing" or "popping" sound.
Loose or worn A/C drive belt. Tighten or replace. If serpentine belt, replace.
The squealing noise from your car's AC when you turn it on could be due to a worn-out or loose drive belt, which may need to be replaced or adjusted by a mechanic.
You may need to adjust your belts, check the ac belt first.
a loose belt between an engine pully and your AC pump is causing the squealing noise a loose belt between an engine pully and your AC pump is causing the squealing noise oic, come to find out that a bolt broke off that holds the pully that was causing the belt the squeel. Also, they ended up just replacing the water pump, saying, while we are in here, you prolly need another water pump cause they tend to got out at 60,000 and up, which is what my cars miles is. Thanks.
AC Compressor
Your AC compressor may be squealing due to a worn-out belt or a malfunctioning compressor. To fix it, you can try replacing the belt or having a professional inspect and repair the compressor if needed.
check a/c compressor and belt.