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AC retro fit problem. Compressor make a racket...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by NateAz87k5, Apr 26, 2002.

  1. NateAz87k5

    NateAz87k5 Registered Member

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    Location:
    Phoenix, AZ
    I thought this would be an easy do it your self type of job but I guess not. Here is my problem. I had my A/C charged with
    Freeze 12 from a shop last year 3 months later the compressor went south. So this year I decided to go to R134 (easy to get
    and no certification needed) and replace the accumilator and compressor at the same time. I removed the compressor and
    accumilator and flushed the system to clean out all of the old oil. I bought a new accum. and a rebuilt "Factory Air" compressor
    from Autozone as well as a R134 Retro kit. I attached the accum. with no problem. Next came the compressor. Before
    installing the compressor I put 1oz of PAG oil into to it. The instructions also say that the compressor shaft must be rotated min.
    10 times to clear lubricant from the cylinders. I did this more that ten. Yes I rotated the shaft and not just the pulley. Next I
    installed the compressor onto the truck and made sure all the hoses and everything where set back up. Next I replaced the
    High and Low side fittings that came with the Retro kit. Now according to all the instructions I was ready to charge. The Retro
    kit states: Start vehicle and turn A/C to max. Then put in two cans of R134 into low side suction with can upside down(per
    instructions). Once I started to put the first can in the compressor clutch activated and was making a bad sound. I thought it
    might be that the system doesn't have enough oil. So I took the 8 1/2 oz can of oil that comes with the Retro kit and put that in
    next. No change in compressor noise. I then put another can of R134 in and the clutch stayed engaged but the noise was still
    coming the compressor. I stopped the engine and looked over everything that I had done and looked to make sure that nothing
    was lose. I turned the compressor shaft again and turned the A/C system back on. No luck. Compressor still noisy. One thing
    that I did notice was that the compressor was getting pretty hot. I stopped right there. What did I do wrong?
     
  2. Michael

    Michael 1/2 ton status

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    It sounds like you did a good job....I don't know, but if you post here you should get some good replies.
    <a target="_blank" href=http://www.aircondition.com/>http://www.aircondition.com/</a>
     
  3. 87GMCJimmy

    87GMCJimmy 1/2 ton status

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    Probably piece o-crap compressor from autozone. I had the same problem. Their rebuild quality sucks. I know this is too late for you if buy on from the their have them get every compressor the they have in the store and spin them. You will notice a huge difference in the "tightness" of the compressors on their shelves! Once you check them all out pick the best one. Some thing not listed in your procedure is pulling a vacuum on the system for 20-30min before charging. This will not cause immediate compressor failure but over time the moisture left in the system can. It will also not blow as cold. I did run with a noisey compressor for 2 years and it still worked when I pulled the motor.

    Hope this helps.
    Mike
     
  4. BlueBlazer

    BlueBlazer 1/2 ton status

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    Sounds like you ruined the compressor when you put the refrigerant in. Even if the directions say so, NEVER add refrigerant with the can upside down. It is faster, however it adds liquid refrigerant to the system instead of a gas that would rise to the top in the can. Most likely the refrigerant made its way to the compressor in liquid form and since liquid doesnt compress something had to give in the compressor. Most likely a reed valve or a ring on the compressor piston. If you take off the compressor and find this to be the case Id be calling up the refrigerant manufacturer and telling them to buy a new compressor since there directions led you to ruin your compressor. Hope you get this worked out.
     
  5. Ck1500

    Ck1500 1/2 ton status

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    you can charge your suction side with liquid, there is no Problem with that, just you need to make sure your not letting it go wide open, 100% this will cause the compressor to what we call "Flood" i would think that he did basically everything right, cept the system was not pulled into a vacuum which would definatley make the compressor make some awefull noises, cuz there is definatley moisture in there also not to mention R-12 oil and that will affect alot, umm did he use a manifold guage to hook up? or just the crap hose with the can of freon?

    if he used manifold guages , he would be able to tell the suction and head pressure of his unit? if these are abnormal i would take the compressor back to autozone

    just my 2 cents worth

    Ck1500
     
  6. BlueBlazer

    BlueBlazer 1/2 ton status

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    So youre saying its not possible that liquid refrigerant made its way to the compressor the way he added it? Would you agree that turning the can upside down adds refrigerant in the liquid form? Would you also agree that the liquid refrigerant making its way to the compressor would result in a failure of the compressor? The way he made it sound is he added the refrigerant and then the compressor started making a racket and is ruined now, thats what led me to come up with my theory.
     
  7. From the start it sounds like you did everything ok, however I have yet to see a rebuilt R4 comp. work well. I would ditch the rebuilt and spend alittle more on a Delco comp. Also, one thing I found very useful when I did my retro was to install an self adjusting orfice tube filter, and installing an electric fan with a relay driven by a mercedes a/c high pressure switch installed in the liquid line at the condensor. As a result my system is cooling much better then when my 89 V1500 was new.
     
  8. Ck1500

    Ck1500 1/2 ton status

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    i am not saying any ones wrong, i was just saying unless you are flooding that compressor its going to charge fine, with the can upsidedown. and yes that is how you get liquid outta the can unless it has a diptube built into it, i am not saying anyones wrong, i am just adding my own opinion.

    sorry for stepping onto your toes

    Ck1500
     
  9. BlueBlazer

    BlueBlazer 1/2 ton status

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    Im the one that should be sorry, my post was pretty blunt and I didnt mean it to be that way. Im in the process of learning about this stuff in my HVAC class so Im not very exprerienced in this. I see that youre an HVAC specialist so I think your opinion means a lot more than mine. Anyway, sorry about that.
     

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