Only if it is VERY loose and not making the A/C unit turn, or not turn fast enough to operate properly. On most modern vehicles, there is no dedicated a/c belt, but a serpentine belt that runs all or nearly all engine accessories including alternator, steering pump etc. If the belt is loose, it should be tightened or replaced ASAP or engine damage could occur. This is not as likely on older vehicles with dedicated a/c belts. In either case, if the belt is still turning the a/c unit, the problem probably lies elsewhere, leaked refrigerant, electrical, etc.
Check for a loose power steering belt.
My guess would be a loose or disconected wire
There can be quite a few reasons as to why the compressor is squealing when the a/c is activated. The most common cause is a loose accessory drive belt (or serpentine belt on some vehicles). Another cause is a loose or weak a/c clutch or possibly a faulty or defective compressor. Try tightening or replacing the accessory drive belt/serpentine belt. If that does not work, have compressor checked at a qualified repair facility.
Check for a loose "Tach" wire
A disconnection in your wiring. loose wiring.
It's probably a loose connection, but it might be the switch.
You hold the tensioner arm out in the loose position with a ratchet. There's a square hole in it for that. Then the belt will be loose and you just work it out. There's a routing diagram in the engine bay.
You hold the tensioner arm out in the loose position with a ratchet. There's a square hole in it for that. Then the belt will be loose and you just work it out. There's a routing diagram in the engine bay.
There are several things that can cause your GMC Envoy dim lights not to work. The most common cause is a blown fuse. A loose or corroded ground wire can also cause a problem.
a loose wire or fuse
For both your heater and air conditioning not to work means you either broke a belt or the belt is loose. Overheating would also be caused by this, because your water pump is driven by the same belt. Do not drive it until you get it fixed, you'll kill that engine by overheating it.
innaccurate work