| Re: A/C Belt chirps when compressor first engages [message #369592 is a reply to message #369566] |
Tue, 03 May 2022 09:22   |
rjw
Messages: 697
Registered: September 2005
Karma:
|
Senior Member |
|
|
rjw wrote on Tue, 26 April 2022 15:46I finished rebuilding my dash air (new Sanden compressor, filter dryer, 18 ounces of Duracool & expansion valve + flushed lines, evaporator & condenser). I finished the day before we left on our current trip to Kentucky. It blows cold air and cools the cab sort of OK on the 80+ degree day we had on the way down. It seems to work as well as you can expect a type II system to work.
The only issue is the compressor belt will chirp a bit when the compressor clutch first engages during high way speeds. It does this once every 10 minutes or so which is annoying and potentially damaging to the belt. I am pretty sure the belt is not on tight enough.
I was in a hurry to get everything buttoned up before leaving so I didn't pay too much attention to the tightness of the belt.
Thanks Matt, Ken, JR and others who responded to my question.
As it turns out I had an old compressor v-belt that was apparently too narrow. While at my son's place I tighten it as much as I could with what tools I had. From there we drove to a state park not far away and during that short trip the A/C cooled satisfactory but didn't sound quite right. But there was no longer any chirping.
After leaving that park we drove to a Harvest Hosts location near Cincinnati. Just as we were approaching parking I noticed a sound I had never heard before. I stopped and popped the hatch and noticed right away that the compressor belt was off and hanging between the fan and the engine. It was intact and after inspection it looked like it had been riding in or close to the bottom of the compressor pulley groove. It was a Gates 7612 XL and measured 10.21MM in width. Apparently too narrow and probably the cause of unusual sounds etc.
That belt had been on since 2012 (over 55,000 miles) but the A/C had not been functional for at least 5 years. We had been using house A/C during that time.
Now I need to figure out the correct belt to use with a Sanden compressor. Will a 15570 air conditioner belt from www.vbeltsupply.com work?
I knew about using a 10MM wrench etc. to check belt width, but it's been a long time since I last worried about the v-belts in my GMC.
I had other v-belt issues on this trip, but will start a new thread to discuss them.
Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com
Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
