coolant leak
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Northstar Engines and System Technical Discussion Discussion, coolant leak in Cadillac Engine Technical Discussion; I have a strange one, I had my rad changed about a month ago and I have had to fill ...
  1. #1
    irishbear's Avatar
    irishbear is offline Cadillac Owners Member
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    Angry coolant leak

    I have a strange one, I had my rad changed about a month ago and I have had to fill the overflow 3 times now. I took it back and they did a pressure test and all is well. No leaks anywhere. I have had the car checked for gases in the coolant just in case it was my headcasket and all is clear. I use about 1 gallon every 2 weeks. Car is running great and no overheating on the highway. Stays at 196'. Anyone hazzard a quess?

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    happyjoey is offline Cadillac Owners Member
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    Red face Re: coolant leak

    water pump they leak just befor they fail. My 3 days of owning a rare 1986 devile convertable has me installing a new one at no small expence.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: coolant leak

    You are leaving 2" - 2 1/2" of air space in the tank aren't you?

  5. #4
    00 Deville's Avatar
    00 Deville is offline Cadillac Owners Connoisseur
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    Re: coolant leak

    Quote Originally Posted by irishbear View Post
    I had my rad changed about a month ago and I have had to fill the overflow 3 times now.
    How much coolant would you estimate that you added in the past month?

    Sometimes these cars will pass a short pressure test. Here's a couple of options to try....

    Slide a piece of cardboard under the car when you park it overnight and see if you have any spots from leaks on it.

    If you don't... borrow a pressure tester from an auto parts store... some will loan you one for free. Pump up the recovery tank to 15 PSI let it sit overnight or longer and check the cardboard for leaks again.

    I had a slow leak on both my 2000 and 2002 that would only leak occasionally and would evaporate on a hot surface before hitting the ground. They would pass a short pressure test (couple of hours) but would fail an overnight check. Both of them ended up being the water pump cover gasket.

  6. #5
    brandond25 is offline Cadillac Owners Fanatic
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    Re: coolant leak

    Not exactly sure what to say except for this. If you do end up doing a water pump job, not sure how much of a difference there is between your car and my 95 deville but when you do the water pump, or the water pump gasket, once you pull that pump off for either or, change the water pump inlet gasket. If you dont, you will put the pump back on bolt everything down and begin to fill her up when you notice you are pissing water from the water pump inlet gasket. It happened to me. Just giving the heads up.

  7. #6
    Playdrv4me's Avatar
    Playdrv4me is offline Cadillac Owners 10000+ Posts
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    Re: coolant leak

    The coolant has to be going somewhere. Note that if you do a test for exhaust gases shortly after adding to or changing the coolant in the recovery tank there is a -chance- you may get a false negative from that test. 3 times in a month is an awful lot of coolant if you aren't overfilling (see Ranger's post above).

  8. #7
    irishbear's Avatar
    irishbear is offline Cadillac Owners Member
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    Re: coolant leak

    No, I am not over filling, 2 1/2" left. It is now losing about 1/4 gallon in 2 days. Checked the oil and antifreeze, they looked good. Drove from Brampton to Pickering and back (180 km) not overheating at all. Stays @ 196 even. No smoke. I will try the test again as well as Monday morning take it to my mech. and have him do the test as well as an overnight pressure test. If you can think of anything else. I will keep you posted.

  9. #8
    Ranger's Avatar
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    Re: coolant leak

    Northstars don't put coolant in the oil so don't bother looking. It's probably a small leak that evaporates before it drips. Radiator side tanks are a common leak point.

  10. #9
    irishbear's Avatar
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    Re: coolant leak

    It is a brand new rad, would I still get a leak from the side?

  11. #10
    Ranger's Avatar
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    Re: coolant leak

    Not likely.

  12. #11
    aclin is offline Cadillac Owners Member
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    Thumbs up Re: coolant leak

    Thanks Ranger. I was having the same problem. I'm new to Cadillacs.Just bought mine two weeks ago. So i was over filling it! makes since because the two times I filled it and would go driving and then park I would smell antifreeze. thanks again! I'm learning everyday.

  13. #12
    irishbear's Avatar
    irishbear is offline Cadillac Owners Member
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    Unhappy head casket

    I could not find my last post as it was moved, so I hope it is ok to start a new one. I took my car in to my mech. today as it was losing coolant. If you remember 1 quart a week. It is not overheating on highway as it always sits @ 196 degrees. We did a gas test last week and it came up negative. My mechanic put the probe into the radiator and got a reading of over 700 (He said it should be near 0). Now my question is, does anyone know of someone who can do a head casket job. I live in Pickering Ontario Canada. I can not afford to go to the dealership for this. The car is mint so I do want to keep it.

  14. #13
    Slipgate is offline Cadillac Owners Enthusiast
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    Re: head casket

    Head gaskets are expensive (95% labor). Try your local corner mechanic but they are most likely going to be the same as the dealer. Most places go by a book that quotes how many hours a job should take. I'd recommend that you do it yourself. It really is not that hard and you will learn a lot from doing it.

  15. #14
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    Submariner409 is offline If it won't run, stick on fender vents
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    Re: head casket

    ...............or you could contact your Canadian neighbor at www.northstarperformance.com

  16. #15
    irishbear's Avatar
    irishbear is offline Cadillac Owners Member
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    Re: head casket

    Does no one know onyone closer, they are down by Detroit, 8 hours away. I am close to Toronto.

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