ac comperessor bypass pulley
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, ac comperessor bypass pulley in Past Cadillac Vehicle Discussion; I have a 1978 Cadillac Coupe Deville with a 425 motor 4brl carb. My a/c clutch seized up, I charged ...
  1. #1
    cooper78 is offline Cadillac Owners Member
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    ac comperessor bypass pulley

    I have a 1978 Cadillac Coupe Deville with a 425 motor 4brl carb. My a/c clutch seized up, I charged the belt it started spinning then it'll stop, but after that behind the clutch the ac compressor started smoking. Original I was going to replace just the clutch then the compressor. Now I want to just delete the whole unit and get a bypass pulley bracket. Can anyone suggest a website to buy from and/or the type of pulley I need. Thanks Calvin

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  3. #2
    Robin Banx's Avatar
    Robin Banx is offline Cadillac Owners Fanatic
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    Re: ac comperessor bypass pulley

    The cheapest way to fix it would be to get a good used pulley/clutch assembly for your existing compressor, install it and leave the wires disconnected so it can't be turned on. It should free-wheel forever.

    Cheers.....R.

  4. #3
    csbuckn is offline Cadillac Owners Master
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    There is a belt you can buy. I have it on my caddy but its in storage. Ill see if I can find a part number. The belt would just go over to the power steering pulley, no need to run a delete pulley.

  5. #4
    drmenard is offline Cadillac Owners Enthusiast
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    Re: ac comperessor bypass pulley

    csbuckn is correct.. Just get a short belt that goes from the crank to the power steering.. I would take a rope and run it around the two pulleys to get how long of belt you need .

  6. #5
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: ac comperessor bypass pulley

    Quote Originally Posted by drmenard View Post
    csbuckn is correct.. Just get a short belt that goes from the crank to the power steering.. I would take a rope and run it around the two pulleys to get how long of belt you need .
    This works. I've done it.

  7. #6
    Ratcad78 is offline Cadillac Owners Member
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    Re: ac comperessor bypass pulley

    How does this work with a fuel line in the way?

  8. #7
    csbuckn is offline Cadillac Owners Master
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    It doesnt work. Move the line or dont do it. Belts and gas lines dont mix well.

  9. #8
    Ratcad78 is offline Cadillac Owners Member
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    Re: ac comperessor bypass pulley

    What is the best way to move it? Should I go to a braided line?

  10. #9
    csbuckn is offline Cadillac Owners Master
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    Yep, some type of flexable hose.

  11. #10
    Ratcad78 is offline Cadillac Owners Member
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    Re: ac comperessor bypass pulley

    Cool, thanks for the help

  12. #11
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: ac comperessor bypass pulley

    I do not remember having to move the fuel line.

    Pretty sure the water pump pulley had to be moved to get the belt in place. It is very close to the crank pulley and the belt won"t squeak by.

  13. #12
    Fleetwood472 is offline Cadillac Owners Fanatic
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    Re: ac comperessor bypass pulley

    I did this on my 78 fleetwood and didn't have to move a fuel line. Mine did not have the smog pump so if yours does it may be different. I used a shorter belt which just ran from the crank to the power steering pump bypassing the a/c compressor. You just adjust the tension of the belt at the power steering pump. The belt for the water pump usually runs from the water pump to the alternator to the crank and that one should not need to be changed. You may have to move it out of the way to change the belts but that would be it. Again this is for a Non-smog pump configuration. If yours used the smog pump it will most likely be different.

  14. #13
    Ratcad78 is offline Cadillac Owners Member
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    Re: ac comperessor bypass pulley

    I still have the smog pump and there is a steel fuel line right in the way from the crank to the water pump. I've looked at it every which way possible and the only solution I can come up with is to move the fuel line, maybe install a braided line so it frees up the space for the new belt. The steel fuel line is connected to a fuel filter located under the water pump.

  15. #14
    Ratcad78 is offline Cadillac Owners Member
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    Re: ac comperessor bypass pulley

    So I opted to change out the compressor clutch and I am feeling defeated at this point. I removed the old clutch and am trying really hard to install the new one but I can not get the second piece to slide into place. It is stuck about half way on the compressor shaft. It will not move anymore. I don't know if it's due to the heat and expansion but it just won't move. I even tried installing the front piece in hopes to be able to use the nut and tighten everything into place but I can not get the front piece to slide onto the shaft as well. I'm pretty stuck "literally" at this point. Any help would be greatly appreciated.

  16. #15
    mrmisanthropy is offline Cadillac Owners Member
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    Re: ac comperessor bypass pulley

    I know this is an old thread, but I just did the bypass on my 78 fleetwood, and for the record, it's a 47.5 inch belt to go from the crank pulley to the power steering pulley . You could probably get away with a 47 incher too.
    Benzilla likes this.

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