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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 94 FWB coolant leaking on water pump in Past Cadillac Vehicle Discussion; Originally Posted by cadillacmike68 Don't forget the GM pellets. Had you not said this, I would have forgotten the GM ...
  1. #16
    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    Quote Originally Posted by cadillacmike68 View Post
    Don't forget the GM pellets.
    Had you not said this, I would have forgotten the GM pellets. Never heard of these before today. Just gotta figure out where to get them...

  2. #17
    jayoldschool's Avatar
    jayoldschool is offline GM RWD V8 addict
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    Do not use pellets in an lt1 car.

  3. #18
    Cadillacboy's Avatar
    Cadillacboy is offline Cadillac Owners Connoisseur
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    Re: 94 FWB coolant leaking on water pump

    We have not been usin' 'em on our Fleetwood , glad to hear that lol
    However, 96 came with Dex cool coolant as well as pellet to my memory

  4. #19
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    jayoldschool is offline GM RWD V8 addict
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    Re: 94 FWB coolant leaking on water pump

    Dex+pellets=clogged heater core

  5. #20
    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    Quote Originally Posted by jayoldschool View Post
    Do not use pellets in an lt1 car.
    Ahh, so no pellets then?

    I just got the old pump off and gotta get some gasket glue then install the new one. Ended up being a lot more stuff in the way than I thought. I might end up deleting the A.I.R thing if I can.

  6. #21
    jayoldschool's Avatar
    jayoldschool is offline GM RWD V8 addict
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    Re: 94 FWB coolant leaking on water pump

    No pellets.

    Yes, the job is much easier with the air pump gone! You can get plugs for the manifolds at Home Depot. Don't even try removing that front tube in one piece, just cut it in half below the balancer. NOTE: removing the air pump is technically not legal on the 1994. It is legal on the 1995 and 1996, and you need an updated TSB sticker to go on the core support. If you live in an area with strict visual inspection, do not remove it.

  7. #22
    cadillacmike68's Avatar
    cadillacmike68 is offline Cadillac Owners Connoisseur
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    Exclamation Re: 94 FWB coolant leaking on water pump

    Quote Originally Posted by jayoldschool View Post
    Do not use pellets in an lt1 car.
    Quote Originally Posted by Cadillacboy View Post
    We have not been usin' 'em on our Fleetwood , glad to hear that lol
    However, 96 came with Dex cool coolant as well as pellet to my memory
    Page 6B-8 of the 1996 Service Manual (book 2) states: Important. When refilling the cooling system add two engine coolant supplement sealant pellets GM PN 3634621 or equivalent and coolant antifreeze meeting GM Specification 6277-M.

    Only 2, not 6 as for the NorthStars or 4100s.

  8. #23
    jayoldschool's Avatar
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    Re: 94 FWB coolant leaking on water pump

    I'm well aware of what it says. I'm just giving advice on twenty years of owning multiple LT1s (and most long time LT1 guys will tell you the same thing). GM was unaware of the effects of the tabs/Dex combo when the FSM was written. As always, people can do whatever they like. However, if you add tabs, I will say that I hope you like flushing heater cores

  9. #24
    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    I see Dexcool is not green, though when I drained the system it looked like your standard coolant. I'm also not seeing anything in the bay mentioning to only use Dexcool. With this in mind, should I drop 2 of the pellets in when I refill?

  10. #25
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    DEX-COOL didn't exist in '94. Your car was filled with "regular" coolant at the factory.

    ...And FWIW, there is no reason ANY car "requires" DEX. There is nothing special about the aluminum, steel, rubber, and plastic in '96+ GM engines and cooling systems that makes DEX necessary. DEX was designed to be a long life (5 year/100K mile) coolant. And in '96, it was. But most green coolants have been rated for that for over a decade now. There is almost no difference between DEX and standard coolant anyway, other than color and the fact that DEX is scold ate free.

    Also FWIW, GM no longer recommends or uses the pellets. As Jay said, they're known to clog heater cores and other small coolant passages. If for some reason you do decide to use them, they go into a hose, not the surge tank.

  11. #26
    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    Thanks. I'll hold off on the pellets but I'll keep them on hand in case anything starts leaking. Got the pump installed yesterday but I won't be finishing the rest of the hoses and coolant fill until next week. Hopefully everything works out.

  12. #27
    HUF's Avatar
    HUF
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    Re: 94 FWB coolant leaking on water pump

    By the way, adding Bar Leaks Tabs or powder makes the engine run a few degrees hotter. This is from my experience. Did it two times and got the same result to my surprise.

  13. #28
    MoistCabbage's Avatar
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    Quote Originally Posted by netfreak
    Thanks. I'll hold off on the pellets but I'll keep them on hand in case anything starts leaking.
    If something starts leaking, why not just fix it correctly?

  14. #29
    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    Quote Originally Posted by MoistCabbage View Post
    If something starts leaking, why not just fix it correctly?
    It's a backup plan. I don't mind throwing parts at problems but I really never want to remove another LT1 water pump...

  15. #30
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    Re: 94 FWB coolant leaking on water pump

    If you do the work correctly, nothing will leak. Don't worry.

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