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AC/Belt Vibration Problem on a Carbed 86

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by AntAZBlaz, Jun 9, 2003.

  1. AntAZBlaz

    AntAZBlaz 1/2 ton status

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    Hey

    First off hello to everyone it’s been a while since I’ve been on the site.

    Here is the background. I have an 86 350 carb from the factory.

    Here is the problem when I turn on the truck on everything runs smooth. When I hit the AC the belt for the compressor starts vibrating up and down hard. When the engine is off I can check the belt for deflection and it only moves about ¼ inch when you press on it hard so I don’t think that it is caused by a lack of tension.

    I have noticed that when the idle is set lower the vibration increases. When I crank up the idle the belt vibration decreases but then I end up dieseling when I turn the truck off.

    So what can I check for to get this problem worked out?

    Thanks for any help.

    King
     
  2. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    bent compressor shaft?
    this is a good question.
    Grant
     
  3. Doug M

    Doug M Registered Member

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    Mine does the same thing, I've heard lots of others do it as well. It has ran fine that way for at least 6 years now, no problems.
     
  4. KShortell

    KShortell Registered Member

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    My 1986 Suburban does make a noise, too. Here's the scoop from a post I made on another board a while back...


    "Yeah, a dull moan, right? It's the drive pulley for the compressor. It's "normal" and nothing to worry about. Mine's done it for years now. However, there is a "fix" for it and was posted here a while back. Essentially, it's a matter of swapping out for a heavier pulley.

    Found it!


    In reply to:
    --------------------------------------------------------------------------------

    With warm weather just right around the corner, I felt now would be a good time to address this problem. When I got my truck, the A/C system would make a strange moaning and vibrating noise when I used the A/C. I found out there was a TSB addressing this issue. This covers '85-'88 light duty trucks and vans with the R-4 compressor using a regular drive belt. If your truck is experiencing this problem, get p/n 6552402 compressor pulley. It is heavier than the original and it will take care of the noise. Replacing the pulley requires special tools, so when you get the part, I would let Chrevolet or an A/C shop put the part on for you.

    1987 4x4 Shortbox Stepside
    www.picturetrail.com/87BlkStepside "

    Hope this helps...
    Kevin
    /forums/images/graemlins/burb.gif
     
  5. AntAZBlaz

    AntAZBlaz 1/2 ton status

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    thanks for that message, i tried doing a search but i wasnt to successful. i'll try looking up how much that part costs thanks.
     
  6. kp texan

    kp texan 1/2 ton status

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    Sorry to dig this old thread back up but it I've been trying to track this part down and I've found out that it's a GM discontinued p/n and that only 2 dealers in Texas have one! The price on the new pulley is $115 so I'm not sure if it's worth it to fix this annoying noise. Do any of you other guys currently have this same issue?

    Thanks,

    Wes
     

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