So lately with the AC on or when the RPMs drop low I have been getting an awful screaching noise. It only happened on downshifts and some other random times. I thought it was the A/C compressor going until I checked the belt tensioner. It was almost frozen solid to the point that the surface had melted plastic marks where it wasn't spinning on the belt. The belt now has a mark on one side where the fozen wheel was. Thought I would share with anyone having screaching issues!

Do you guys think I should go ahead and replace the belt out of the possibility the non-spinning wheel might have weakened it?

 

you could, but its not a belt tensioner.

 

Belt tension sensor! Whatever you know what I mean

 

If the screeching sound is gone, and the belt isn't heavily frayed, I'd probably leave it alone

 

Are you going to replace the Belt Sensor?
That would be first and then a close look at the belt. If in doubt, replace.

 

That belt sensor is for the cooling fan belt. If that belt goes, a light on the dash comes on.

Replace both the cooling fan belt and the sensor. Then keep an extra cooling fan belt in the car.

In fact, I would replace all three belts and be done with it for a while. I'd also keep a spare alternator belt in the car. Ask me why.

On-board spares.

A/C Locknut mod.

 

Mine just broke on my C4, picked up a new one from FD Motorsports for a great price. It takes about 3 min to change out.

What you can do is remove it, or put a zip tie on the arm till you fix it.