94 FWB coolant leaking on water pump
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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; My FWB is parked for the winter and I go warm it up every couple weeks, and I've noticed that ...
  1. #1
    netfreak is offline Cadillac Owners Member
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    94 FWB coolant leaking on water pump

    My FWB is parked for the winter and I go warm it up every couple weeks, and I've noticed that it seems to be leaking coolant on the water pump. This seems to happen while its parked as it evaporates after warming up. Below is a picture showing the moisture before I warmed up the car. My guess is a leak at the thermostat housing. Does this sound accurate?

    leaking_coolant.jpg

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  3. #2
    outsider is offline Cadillac Owners Connoisseur
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    Re: 94 FWB coolant leaking on water pump

    There is also a bleeder screw on the thermostat housing if I remember correctly. If you pull off your air intake elbows you may be able to see more.

  4. #3
    Cadillacboy's Avatar
    Cadillacboy is offline Cadillac Owners Connoisseur
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    Re: 94 FWB coolant leaking on water pump

    We replaced our leaking water pump a few years ago , it was just a precautionary because you could hardly tell there was a leaky water pump but we were told it would go bad to worse and if it leaks it will also wreak havoc on distributor hence bigger repair bill
    Well, it's up to you but if you drive your car is your work horse so to speak it's a better idea to have it replaced because it's a failure that you can leave you stranded at wrong time wrong place

  5. #4
    cadillacmike68's Avatar
    cadillacmike68 is offline Cadillac Owners Connoisseur
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    Re: 94 FWB coolant leaking on water pump

    ^^ replace it now before the opti-spark gets FUBAR'd

  6. #5
    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    Thanks, I'll take a closer look next time I'm at the car and likely order a new water pump for it before I start driving it again.

  7. #6
    MrHolland's Avatar
    MrHolland is online now Super Moderator
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    Re: 94 FWB coolant leaking on water pump

    I like an OEM water pump. Just my preference!!

  8. #7
    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    Anyone happen to have some manual pages showing how to replace this? I'd imagine it's mostly straightforward but I don't have a shop manual. My first question would be how to actually drain the cooling system...

  9. #8
    outsider is offline Cadillac Owners Connoisseur
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    Re: 94 FWB coolant leaking on water pump

    There's a petcock at the bottom of the radiator but I've never liked using those. I usually just pop the bottom hose off the radiator.

    I can try to get you some pictures of the manual pages when I am home. I have the 95 shop manual but I imagine it's the same for 94.

  10. #9
    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    Ah thanks. Yeah if it is easier just popping off the lower hose I might just do that. Probably replace the hoses too while I'm at it.

  11. #10
    outsider is offline Cadillac Owners Connoisseur
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    Re: 94 FWB coolant leaking on water pump

    yeah and then you don't have to worry about that petcock leaking after opening it up.

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    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    Hey all, I've got all my parts in and I'm in the process of replacing everything but one thing I'm not sure about is refilling the cooling system after... Do I just start pouring into the reservoir? How do I deal with air in the system?
    EDIT: actually I think I've got it. Have the car running as I fill it and keep filling until I get steady coolant coming out of the bleeder near the thermostat?

  13. #12
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    jayoldschool is offline GM RWD V8 addict
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    Re: 94 FWB coolant leaking on water pump

    Yes, keep the cap of the reservoir, keep it idling until the stat opens, it will suck down coolant, keep filling until the level stays the same. Close the cap, bleed it. Don't burn yourself. Make sure you put sealant on the water pump bolts, they go into the water jacket. No sealant/gasket on the stat housing, just the O ring around the actual stat. You MUST use the correct LT1 180F stat, not the old SBC style!

  14. #13
    netfreak is offline Cadillac Owners Member
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    Re: 94 FWB coolant leaking on water pump

    Ah thanks, I'll have to get sealant for the pump bolts. For the thermostat I've got a Gates 33788.

  15. #14
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    Re: 94 FWB coolant leaking on water pump

    That's correct stat.

    For the water pump, I like to glue the gaskets to the pump with a thin layer of Ultra, let it set up. Then, a thin layer on the gasket back where it meets the block. Bolt the pump up (make sure the drive/o rings are good), and leave it overnight (or a few hours later in the day). Fill the next day after the Ultra has set up.

  16. #15
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    Re: 94 FWB coolant leaking on water pump

    Don't forget the GM pellets.

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