Ac compressor air gap

[Booch]

Getting a whine / metal on metal noise from my ac compressor, right at the pulley. Sound goes away when ac is turned on.

From what I've read, sounds like the air gap needs to be adjusted on the pulley / clutch assembly, but I can't find a link or post that shows how to do this......any help?

[brcidd]

What year Blazer? Can't see it from here- does make a difference. You can borrow the clutch puller tool from Autozone and pull the driver back to make a gap of .020".

[DeltaP]

The gap is usually adjusted by adding or removing shims located on the compressor shaft just behind the clutch hub. They're like small washers. But its rare to have to add shims. It usually works the other way around. I would check the hub plate and springs themselves. You could have a broken hub plate spring. Turn the hub by hand,(engine off of course). See if the hub rotates evenly and the gap doesnt change. If it does theres a broken spring and you'll have to replace the hub.

[brcidd]

Sorry DeltaP-- no shims on a Harrison compressor of that era....they are press fit if his blazer is an S/T blazer 90's to early 2000 model..we don't want to mislead OP....

[Blue Bowtie]

It's a set of leaf springs. This is a common issue, easily solved by bending the leaves back unit a gap is achieved. I've done quite a handful that way. The toughest part is on wrong-wheel-drive car and getting good access to the clutch.

[Booch]

Thanks for the info guys.....it's a 2002 Xtreme with a 4.3 liter, automatic trans (if that makes a difference.....)

Talk about a small world, brcidd.....I lived in Troy OH from 2004 to 2007, on Woodbury Court, kind of behind Meijers!

[brcidd]

Booch--- This is me

http://idle-hourranch.com

[Jeff Collision]

You need to reset your air gap. Get a proper puller tool and clean out the threads in the clutch hub and pull it out to about .020" gap, what you have if light and tinny/hissing sound is clutch drag noise. If its a deeper growl, perhaps it may be the pulley bearing.

[Booch]

Jeff

Do you have or can you provide a pic with exactly where I'm going to be measuring the 0.020"?

Thanks!

Booch

[Booch]

Brcidd;

Wow; REALLY small world! I drove by your place all the time! I was at 553 Woodbury Court. Live in Minneapolis now, but really miss the small town feel of Troy! Is LaPiazza still around?