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Re: 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. http://www.2carpros.com/car_repair_information/tec_info/1999/gmc/sierra/1999_gmc_sierra_drive_belt_routing_diagram.htm
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if the ac compressor won't turn even with the engine off,it's not the compressor but the freewheel bearing inside the pulley,
even if the compressor is bad ,changing the bearing will allow the serp belt to turn the pulley.
I'd just change the bearing .
on the 3.8 liter v6, the pulley on the a/c compressor can be replaced if it is locked up (frozen) on the compressor. the question is what is actually locked up? if the a/c compressor is locked up but the a/c compressor pulley turns, then you need to disconnect the wire harness connecter that is on the a/c compressor pulley/clutch so you can run the defrost on the climate control. many GM cars will run the a/c when you switch the climate control to defrost especially in the winter so the a/c system stays lubed and does not lock up the a/c compressor from lack of use. you can then relace the belt without replacing the compressor pulley/clutch assembly. if the compressor pulley/clutch assembly is locked up, it will need to be replaced. i do not believe there is a way to route the belt bypassing the a/c compressor. you dont want the water pump turning in the wrong direction if you reroute the belt wrong or the engine will overheat. i hope this helps!
Loosen the A/C compressor drive belt pulley tensioner bolt.
Loosen the A/C compressor drive belt idler pulley adjustment bolt.
CAUTION: Incorrect drive belt installation will cause drive belt failure. NOTE: Inspect the pulleys for warping or abnormal wear. NOTE: Make sure drive belt is properly installed on each pulley. To install, reverse the removal procedure.
Adjust the A/C compressor drive belt. For additional information, refer to Belt Adjustment—A/C .
There should be a belt tensioner inline of the belt somewhere use a ratchet or wrench to pull on it and belt will get slack in it change the belt but first I would take off old belt and make sure the ac compressor isnt froze up if it is it will only pop the new belt.
The compressor is bad. I have the same problem. Apparently none of the tahoe's compressors are worth a ****! im having to replace mine too. You have to change the compressor, the accumulator/dryer, orifice tube and flush the lines. If you look on ebay you can buy a complete kit to change it all for about 300 bucks. The dealership tells me that you need to change the fan clutch as well. They told me that the reason for the noises is the fan clutch isnt working properly and it lets the compressor get too hot causeing higher pressures in the compressor due to the heat. They called it liquid slugging I believe. Mine doesnt break the belt but when you give it very much gas it makes a squeal and then a grinding noise like your trying to put a standard transmission in gear with it running without pushing in the clutch. I asked if you could just change the fan clutch and they told me no its too late, you have to change the compressor and dryer/orifice tube.
when you take the ac belt of there is also a pully that you need to adjust so you can slide the belt around that as well / reminder loosen compressor bolts so that you can manuever the belt around that and then get the tension by pulling the compressor up
You have to remove the main serpentine belt first. this is done with a 15mm wrench put on the tensioner. then from the bottom you can get to the a/c belt tensioner. install a 3/8 ratchet on it and remove tension from belt. I find the only way to get belt on and off is too slip it off the tensioner then off the backside of crank pulley then slide off of a/c compressor then install new belt onto the crank letting it fall off the backside run belt around compressor tensioner then work around crank pulley