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bearman
Novice
Feb 9, 2010, 6:46 PM
Post #1 of 7
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My 1989 gmc 5.7 litre truck is whinning under the hood.I know the noise is coming from the ac pump. Can I just buy a belt for a truck that does not have air condition?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 9, 2010, 10:12 PM
Post #2 of 7
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Re: 1989 gmc truck
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OK: Compressor is two things/bearings/bushings in compressor and bearing in clutch. If it only makes noise engaged (front plate turning) it would be the compressor and if when the plate is still would be the bearing in the clutch. If quiet when compressor is disengaged you can just unplug it and let the whole thing be a pulley via the clutch. If just the clutch bearing that can be replaced.
If A/C at all it will make a different noise when engaged or disengaged as clutch bearing is relative still when engaged and compressor shaft is still when not engaged,
T
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bearman
Novice
Feb 10, 2010, 5:22 AM
Post #3 of 7
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Re: 1989 gmc truck
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That is what was smoking when I opened the hood. I dont wanna replace it as I am building myself another truck and this one is just going to be used for plowing my driveway. So can a just put a different belt on it?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 10, 2010, 6:27 AM
Post #4 of 7
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Re: 1989 gmc truck
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They key answer is I DON'T KNOW there are four configurations used in this truck. Take the belt off or just aside for a second and see it the pulley will spin free. If not the compressor probably nuked itself bad enough to need just a dead one with good pulley or they make a dummy pulley but it probably won't work with just ordering a belt for the thing as if it didn't have A/C to begin with. Just look at it and see if there's room for the belt to run to next pulley without the compressor at all. If something is in the way it would take all the brackets from one that never had it for all the belt driven items.
I hope it can work without compressor at all for you but can't say. I plow snow as well and would hunt down non A/C old trucks as they have the place to go hydraulic better without it. Currently have Fisher's HOUR MOUNT! P.O.S. that's all electric required here (Mass) model years 1996 and newer or 1984 and newer if you touch anything to do with emissions or even so much as mess with air intake!
OK: Here's two diagrams that only indicate "CS" as the crankshaft not the other items so I can't really tell but if you tell me in the diagram which one is compressor I can make the guess from here or you can at a glance..........
 7-8 is one option for original A/C equipped 5.7
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This would be (diagram 5-10) for original set up without A/C............
If you can or need to - tell me which is compressor counting items clock-wise from "CS" and I can guess,
T
If you can't get a cheap use core to use if needed then hit the site in my sign off for a dummy pulley for where it goes..
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 10, 2010, 6:37 AM
Post #5 of 7
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Re: 1989 gmc truck
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More on this,
If and probably did with smoke seen, the compressor seized and belt slipped hard like burning rubber over a seized compressor. If that didn't make a melted mess a new bearing ~$15 bucks in clutch if shaft of compressor will allow clutch to come off would fix this whole problem with an OE belt. requires clutch puller, rent-able and tell me how bearing is fastened in. Snap ring, peened in or what - I can't guess without your eyes. If so and workable - just unplugging compressor with a good clutch bearing would solve this,
NOTE: A/C will kick on with defrost request even if it doesn't work or is near empty of refrigerant - especially and even just air in there would heat up enough to make adequate pressure to fool it to come on or try to.......
(This post was edited by Tom Greenleaf on Feb 10, 2010, 6:41 AM)
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nickwarner
Veteran
/ Moderator
Feb 11, 2010, 12:22 AM
Post #6 of 7
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Re: 1989 gmc truck
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I had a similar problem with a customer's blazer and there is a kit at negligable cost from O'Reilly's that bolts in place of the AC compressor with an idler pulley. It uses the same belt as the AC equipped engines. Get a new belt as yours is obviously been damaged. It works pretty slick and I think on a 92 Blazer with a 4.3 it was about $35.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 11, 2010, 2:32 AM
Post #7 of 7
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Re: 1989 gmc truck
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That's a great price to eliminate A/C compressor and for a cold weather work truck would be great and could get other crap you don't need out of your way too. Leave but tie off electrics out of harm's way. Cutting off hoses, accumulator etc., would make routine stuff easier too,
T
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