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Cadillac Tech Tips - How to fix it Discussion, Northstar Water Pump Replacment Steps in Item Specific Cadillac Discussion; Thanks got it out and water pump back in. Trying to figure this tensioner out now....
  1. #16
    99esteees's Avatar
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    Re: Northstar Water Pump Replacment Steps

    Thanks got it out and water pump back in. Trying to figure this tensioner out now.

  2. #17
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    Re: Northstar Water Pump Replacment Steps

    Quote Originally Posted by 99esteees View Post
    Thanks got it out and water pump back in. Trying to figure this tensioner out now.
    Got it all back together and ready to go, pending the new upper hose and coolant in the morning. Wish me the best.

  3. #18
    Drparj is offline Cadillac Owners Member
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    Re: Northstar Water Pump Replacment Steps

    Ok I just got done doing a full flush on the coolant and then got it all back together. I actually used one of those $10 flush kits you can get anywhere. They work great and hurt nothing, but they do allow the system to clean out most everything. I remove the thermostat and put back together without one. I then open rediator drain and turn hose on to back flush coupler and then discconnect upper hose and turn motor on. Old fluid will flow out top hose and you run about for 10 minutes and you will see nice clear fluid after that. Then I take coupler off and let motor run for about 30 20 seconds to help push leftover water through motor. Then put everything back together and add bars leak golden seal and dex cool 50/50 and presto nice clean system and no problems ever.

  4. #19
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    Re: Northstar Water Pump Replacment Steps

    I went to pour the coolant in this morning and it all leaked back out. I put in 2 quarts. It feels to be coming from the water pump area, but I don't know what could have gone wrong? I put in a new cover gasket and a new o ring. It's worse than it was before.

  5. #20
    Drparj is offline Cadillac Owners Member
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    Re: Northstar Water Pump Replacment Steps

    Did you make sure to use a torque wrench to tighten everything back up to specs and tighten back and forth evenly on the bolts. Does it look to be coming from gasket area or hose area? Worst case if nothing works try a little bit of liquid gasket to help the water pump gasket make a better seal

  6. #21
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    Re: Northstar Water Pump Replacment Steps

    Pretty sure it's coming from the crossover area near the block. I can't get to a few bolts, so I guess i'm putting it back together and calling the dealer to get a price quote in the morning. Ughh

  7. #22
    Drparj is offline Cadillac Owners Member
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    Re: Northstar Water Pump Replacment Steps

    take it apart look to see if the gasket is messed up and try some liquid gasket on the oem gasket and reinstall. Liquid gasket usually will fill the irregularities. Dealer will charge you $100-$200 most likely to fix with no parts, but sure its something simple.

  8. #23
    STSJim is offline Cadillac Owners Member
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    Re: Northstar Water Pump Replacment Steps

    Big thanks to the OP and everyone else that chimed in! I was able to do this repair in my driveway and saved about $400!!! Anyone considering a DIY water pump replacement... go for it!

  9. #24
    bikesandcars is offline Cadillac Owners Member
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    Re: Northstar Water Pump Replacment Steps

    Thanks for the instructions. One thing I'll ad is to use an impact wrench on the removal tool.

    My water pump was being very stubborn, I had a 3 foot pipe on my removal tool and it wouldn't budge, plus after cranking on it my removal tool started to clip cock-eyed.

    Then I got out my chisel and started to hammer the one tab I could get to, that just mashed the metal, I thought I was really in trouble.

    As a last resort I got out my impact wrench. With my full weight pushing the impact wrench tight against the housing (straight) and on max torque, it took about 20 seconds of impacting to get it off... which is about an eternity in impact-wrench land.

    My suggestion, try the breaker bar first, but if that doesn't work go right to the impact wrench. It didn't damage the tool, and it probably would have come off easier if I hadn't buggered the one tab with my chisel. If I ever have to do one of these again I'm going right to impact.

  10. #25
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    Re: Northstar Water Pump Replacment Steps

    Actually I just was working on my water pump on a 94 4.6 engine. My pump was installed so tightly and or corroded in there that one or two of the slots on the pump started wearing off so the removal tool tabs were just sliding off! I finally got my impact wrench in there and the hammering action of the wrench was enough to carefully pop the tangs of the pump out from under the retaining tabs of the housing. That was really annoying.

  11. #26
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    Re: Northstar Water Pump Replacment Steps

    Also, is there really an orientation for the one tang on the pump that does not look like the others? I just noticed that it looks like a coolant pass through hole is on the pump housing and if you put the unusual tang at the 7:00 O'clock orientation that the manual says to then that pass through hole is straight up and down. Which would seem to make sure that gravitationally the cooling fluid would run through that hole better.

    Well my real question is how do you know that you have the unit seated all the way?

  12. #27
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    Re: Northstar Water Pump Replacment Steps

    I am wondering the orientation of the water pump as well. It came out with a small (12") ratchet easy enough, a few taps on the ratchet got it out. However, I cannot get it back in - even with a 24" breaker. I don't want to take an impact to it until I know its in the correct orientation. I will try tab w/o mini tab in 7:00 position and report back.

  13. #28
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    Re: Northstar Water Pump Replacment Steps

    DO NOT use an impact to install it.

  14. #29
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    Re: Northstar Water Pump Replacment Steps

    Has anyone came up with an answer to the orientation of the water pump tabs for installation?

    Brian

  15. #30
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    Re: Northstar Water Pump Replacment Steps

    Just take note of the tab positions of the old one you remove.
    eldorado_97 and eldorado_97 like this.

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