Question about 1999 GMC Sierra

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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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1 Answer

How to tighten belts on 2003 gmc seirra.


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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...


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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?


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


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Jun 24, 2010 | 1999 GMC Sierra

1 Answer

How do i do it


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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

07e40b4.jpg

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

abe156c.jpg

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

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1 Answer

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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. http://www.2carpros.com/car_repair_information/tec_info/1999/gmc/sierra/1999_gmc_sierra_drive_belt_routing_diagram.htm

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