Waterpump O ring
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Waterpump O ring in Past Cadillac Vehicle Discussion; My son's '98 STS had a coolant leak, appeared near the water pump. He bought a pump from Auto Zone, ...
  1. #1
    jamie1 is offline Cadillac Owners Member
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    Waterpump O ring

    My son's '98 STS had a coolant leak, appeared near the water pump. He bought a pump from Auto Zone, came home from college, we changed it. The supplied 'O' ring was slightly smaller in diameter than the old one. Just small enough that it wouldn't stay in the groove. It was getting late, Sunday, he had head back to school. The only thing I could think of to do, clean the old one, pack the groove with RTV, put it back together. It's leaking, not a lot, but still leaking. I haven't been able to find just the 'O' ring, does anyone know where to get one? I'm guessing the dealer is probably the best/only source. Have to get one for his next trip home.

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Waterpump O ring

    Talk to Chris in parts at Rippy Cadillac over there >>>>

    Tuesday morning.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Waterpump O ring

    He bought a pump from Auto Zone
    First mistake and probably the reason for the ill fitting O ring.

  5. #4
    jamie1 is offline Cadillac Owners Member
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    Re: Waterpump O ring

    Quote Originally Posted by Ranger View Post
    First mistake and probably the reason for the ill fitting O ring.
    Yeah, yeah, yeah, I figured I'd get one or two of these. I know Auto Zone has ticked a few people off, (probably because so many use them). You're probably right, he bought the pump there because it was cheap and available. I've bought many things over the years from Auto Zone, haven't had any problems. A helpful solution along with the Auto Zone crack would've been nice!

  6. #5
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
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    Re: Waterpump O ring

    As the cost for a Delco pump is reasonable, no reason to go AZ.

  7. #6
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Waterpump O ring

    .......... or you could go back to AZ, O-ring in hand, and say "This is a bit tooo small ..........?".

  8. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Waterpump O ring

    That was more of a fact than a "crack" and AZ doesn't tick me off. I buy "dumb parts" there (light bulbs, fuses, wiper blades, filters etc), but the fact is that their parts are cheap for a reason. They simply do not last or don't fit. The only helpful solution I can give is to return it and buy a quality part. The dealer O ring may not fit the AZ part. Maybe the O ring was the right size and the part was made wrong.

  9. #8
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
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    Re: Waterpump O ring

    It's been a while since I did my pump, but doesn't the o-ring go
    in the housing groove, not on the pump?

  10. #9
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Waterpump O ring

    Yep - and in some cases it's murder to keep in place while fooling with the pump capsule. The service manual says to lube it with raw coolant before torquing in the capsule CCW to 73 lb/ft.

    I have had good luck with a decent slap of Vaseline instead of coolant for lubing the O-ring.

  11. #10
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
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    Re: Waterpump O ring

    Exactly what I used , or rubber grease like used on caliper seals/brake part internals.

  12. #11
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
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    Re: Waterpump O ring

    Here it is, hard to find in the US, ordered this from the UK.LUB108.jpg

  13. #12
    92WHTSTS's Avatar
    92WHTSTS is offline Cadillac Owners Fanatic
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    Re: Waterpump O ring

    Where is a good place to purchase a Delco water pump? GM parts online?

  14. #13
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
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    Re: Waterpump O ring

    That's one, get the part number & shop around, I got a great deal on e-bay from a GM dealer,

  15. #14
    Ranger's Avatar
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    Re: Waterpump O ring

    Rockauto or Amazon

  16. #15
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Waterpump O ring

    Quote Originally Posted by Ranger View Post
    Rockauto or Amazon
    Wait 'till you see the little gold oval "Made in China" sticker on the new, boxed AC Delco water pump.

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