Frozen Pulley
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HT4100 4.1, 4.5, 4.9 Discussion, Frozen Pulley in Cadillac Engine Technical Discussion; I have an '89 Seville with the 4.5 engine. On the way home tonight the belt started squealing and smoke ...
  1. #1
    mckimjim is offline Cadillac Owners Member
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    Frozen Pulley

    I have an '89 Seville with the 4.5 engine. On the way home tonight the belt started squealing and smoke was coming out of the hood. One pulley seems to be frozen. It is towards the front of the car below the power steering pump. The manual I have does not show a good view of this. What is in this area? It looks like the AC compressor is down lower and in the middle. Is it a water pump or some kind of air pump? Any thoughts would be appreciated.

    Thanks

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  3. #2
    noahsdad's Avatar
    noahsdad is offline Cadillac Owners Connoisseur
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    Re: Frozen Pulley

    Water pumps and air pumps don't usually sieze, but A/C compressors do. That's most likely the culprit, but it could be the tensioner pulley also. Release the belt by turning the tensioner pulley (at the top) with a 1/2 inch drive breaker bar or ratchet, then try turning each pulley by hand. You can buy a shorter belt and bypass the A/C compressor to get you by until you can replace it.

  4. #3
    mckimjim is offline Cadillac Owners Member
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    Re: Frozen Pulley

    I did release the tension on the belt. The alternator, power steering and tensioner pullies all turn freely. The pulley just below the power steering is frozen. I don't think this is the AC compressor but I could be wrong. It's a tight fit and I didn't have much light.

  5. #4
    gta3mobster's Avatar
    gta3mobster is offline Cadillac Owners Member
    Automobile(s): 1990 Deville Sedan
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    Re: Frozen Pulley

    I'm pretty sure that's the smog pump (AIR pump). If I recall correctly, the AC pump is the furthest one towards the bottom. There should be black plastic lines attaching somewhere to the pump if it's the AIR pump. The water pump pulley is on the bottom towards the firewall (you can tell by the gasket design). The black AIR pump lines run right past the power steering reservoir and down the engine (on my 90. Keep in mind, mine is MPFI, so it might be different for you).
    Make sure to verify this is correct.

    How to fix it, though, I'm not sure. Maybe you could just bypass the pulley with a shorter belt? The Air Injection Reaction system isn't very important from what I've heard. My intake housing has holes for the AIR system, so you'd probably have to plug them up with corks or something if it's the same for you.

  6. #5
    mckimjim is offline Cadillac Owners Member
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    Re: Frozen Pulley

    It was the air pump. Sounds much better now. Thanks for comments.

  7. #6
    MachX's Avatar
    MachX is offline Cadillac Owners Fanatic
    Automobile(s): 1991 Sedan deVille 4.9L/1994 Lincoln Town Car 4.6L
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    Re: Frozen Pulley

    Whoa. Ok, the AC compressor pump is on the front of the engine, and bottom most. The water pump is in the middle of the engine. The air pump is above the AC pump, therefore you can't bypass it.

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