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How to tighten the a/c compressor belt on my 99 gmc sierra

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The belt on that A/C compressor should be automatically tightened by the belt tensioner. If the belt is not pulled tight by the tensioner then you probably need to go get a new one, or even snag one from the local junkyard. On the other hand, if some work has been done recently where the belt was removed. There is a chance that the tensioner may have been taken off and put back on incorrectly (I've seen it before) or maybe even something blocking it from returning to it's proper position. A test to see if the tensioner is any good is to just grab onto it (while the truck is NOT running please) and give it a tug. The spring inside is quite strong and should be difficult to move. if it will move under the pressure of your hand then you probably need a new one. Another possibility is that if the belt was taken off, it wasn't put back on correctly. With all the idlers and pulleys and such in there it's easy enough to miss getting it over one of them, and that could definitely allow enough slack for the belt to slip. There should be a belt diagram under the hood that shows the path of the belt. Take a look and just make sure it's sitting exactly where it should be.

Posted on Aug 20, 2010


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How to remove the a/c clutch from a 1998 gmc sierra 1500 5.7 l

I believe this AC compressor is the same as my '95 Astro. The clutch is pressed on to the compressor shaft. You should see a threaded hole in the center of the clutch and a threaded screw in the center of that hole. To get this off you have to have the proper puller. It threads into the clutch and has a screw that you tighten against the end of the screw in the clutch. This pulls the clutch off the compressor (maybe, if it isn't frozen to the shaft). FYI, I just replaced my AC compressor and found that a new compressor with a new clutch was only about $40 more than the clutch alone. The puller cost $30.) Of course, if you replace the compressor you have the work of some parts in the AC system and recharging it. There are some good web sites with good pictures and instructions you may want to look into before you decide. I found that when I replaced the compressor, I had to replace the accumulator and compressor oil and there is some question about flushing the AC system when you install a new compressor. Hope all this helpful. Good luck.

Apr 22, 2011 | 1998 GMC Sierra

1 Answer

How to tighten belts on 2003 gmc seirra.

The belts are tightened by a belt tentioner assembly, you are probably asking this question because of a squeel, If this is correct change out the belt, and possibly an idler pullly this is common in the sierra's and silverado's

Jan 02, 2011 | 2003 GMC Sierra 1500

1 Answer

I have a 99 gmc sierra with a third door is there away to tighten the thrid door latch so that the door is nit so lose

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Dec 29, 2010 | 1999 GMC Sierra

1 Answer

Im replacing my ac compressor on my 1992 gmc sierra. what i want to do is just have it there so that the belt can still run, but have no ac. do i need to reconnect the coolant lines on the new compressor...

if you root around at a parts store or on ebay you can find an idler wheel and bracket which takes the place of the A/C spot in the belt. also you can toss the whole thing and get a belt made for the engine w/o A/C. you should plug the open lines to prevent contamination in case you ever want to go back.

Dec 03, 2010 | 1992 GMC Sierra

1 Answer

My a/c compressor clutch is going bad and makes a screeching noise...can I bypass the clutch and use a shorter belt....what size belt?

yes you can do this if you having the belt, just diconnect it and put short belt. but after using short belt your a/c will not work till fix the belt to a/c compressor. thanks

Aug 17, 2010 | 1995 GMC Sierra

1 Answer

Where is the tensioner for the drive belt on my 99 gmc sierra

it is a pulley that runs on the belt, should be about 3 inches in diameter and has grooves in it for the belt to run in
they are usually spring loaded

Jun 24, 2010 | 1999 GMC Sierra

1 Answer

How do i do it

you sure its not the serpintine belt not making the noise?..or idler pully? unhook belt and try spinning the compressor and listen for the squeek

Mar 10, 2010 | 1989 GMC Sierra

1 Answer

Need to know the diagram for the serpentine belt for a 99 GMC K1500 with a 5.7 Liter

Fig. Accessory serpentine belt routing-4.3L, 5.0L and 5.7L engines without A/C


Fig. Accessory serpentine belt routing-4.3L, 5.0L and 5.7L engines with A/C


Hope helped with this. (remember rated this). Good luck.

Feb 19, 2010 | 1999 GMC Sierra

1 Answer

Push ac button , compressor doesn't turn on (fuse?)

when's the last time you pushed the button? with engine off see if you can turn the front of the compressor. if it moves then backprobe with a test light.

Mar 24, 2009 | 1999 GMC Sierra

1 Answer

How to Change Compressor Belt

This vehicle has one(1) belt a serpentine belt, this belt runs on all the pulleys on your vehicle . To change this belt is pretty simple there is a tensioner pulley that keeps belt tightly secured on all pulleys by eliminating that looseness. All you need depending on production dat is a 3/8 ratchet or in some applications a 15mm flat wrench. Look for tension I have provide you a diagram with the lay out of you belt .First Identify your system from the diagram before you proceed. Using ratchet/wrenchPull down or up which ever makes tension on belt loose and remove belt. Replace belt in the opposite of taking off following routing diagram. Good Luck contact if you need more help. Thanks for using FIX YA.

Jan 04, 2009 | 1999 GMC Sierra

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