Coolant Level
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Northstar Engines and System Technical Discussion Discussion, Coolant Level in Cadillac Engine Technical Discussion; If the check coolant level message displays on the information center how low is the coolant, how much needs to ...
  1. #1
    STS127 is offline Cadillac Owners Fanatic
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    Coolant Level

    If the check coolant level message displays on the information center how low is the coolant, how much needs to be added. It occured while I was driving today and drove it around another time and did not pop up. The time it happend though the engine was very cold and the message came on right when I pulled out of the school parking lot. Would the cold weather have anything to do with it? Its in the mid 20's today so it is fairly cold out.

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    Ranger's Avatar
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    Re: Coolant Level

    I'm not exactly sure when it is tripped, but it is before it gets critical. You still have coolant in the tank. Just bring up to about 2" from the fill neck. Then keep an eye on it to figure out where it is going.

  4. #3
    Flynn is offline Cadillac Owners Member
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    Re: Coolant Level

    My car has a slight coolant leak at the radiator. (bottom hose I think, haven't crawled under to pinpoint it yet) Anyway, the "check coolant level" shows up on the DIC about every two months or so. I have a 12 oz plastic bottle I fill halfway with DexCool, the other half with distilled water, and pour the whole thing in the surge tank. Not real fancy, but it works.

  5. #4
    STS127 is offline Cadillac Owners Fanatic
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    Re: Coolant Level

    How much does a 96 STS take-15 quarts?

  6. #5
    benshizzle is offline Cadillac Owners Member
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    Re: Coolant Level

    I get this message also. It says check coolant level when its cold outside (below 20F). I popped the hood and it WAS low but after driving for 2 minutes the message went away. I pulled over into a parking lot and checked again and the coolant was at the right level. I think coolant might contract and expand depending on the temperature. this happened in my 2000 DTS a couple of times after sitting outside in cold weather over night.

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    Ranger's Avatar
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    Re: Coolant Level

    If coolant concentration from cold temps is turning on the CHECK COOLANT LEVEL message, then the level is too low to start with.

  8. #7
    STS127 is offline Cadillac Owners Fanatic
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    Re: Coolant Level

    Just bought some Dex-Cool and hope to change coolant this week. I'm figuring level is low and don't know when the last time it was changed(Have maintance records so I'll check them) so I think just changing it all together would be better than adding some.

  9. #8
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    Re: Coolant Level

    Quote Originally Posted by STS127 View Post
    How much does a 96 STS take-15 quarts?
    12.5 quarts

  10. #9
    STS127 is offline Cadillac Owners Fanatic
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    Re: Coolant Level

    ^^ Yeah I think you're right. Transmission is 15 quarts right.

  11. #10
    Cad tech's Avatar
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    Re: Coolant Level

    Transaxle

    Drain and Refill, Requires Drain Plug Removal
    10.4 liters
    11.0 quarts

    Overhaul
    12.0 liters
    12.6 quarts

    Dry
    14.2 liters
    15.0 quarts



    --------------------------------------------------------------------------------

  12. #11
    detroit99sts is offline Cadillac Owners Fanatic
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    Re: Coolant Level

    My coolant level is low also. how often is it recommended to completely change (drain & fill) the cooling system? Ive had the same coolant for 2 years now. Should I drain & fill? Is it safe to flush the system?

  13. #12
    Ranger's Avatar
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    Re: Coolant Level

    Your '99 has orange Dex-Cool so once every 5 years. 2 years for green coolant.

  14. #13
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    Re: Coolant Level

    dont forget to add the tablets to the dex cool....and smash them up before you put them in

  15. #14
    Ranger's Avatar
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    Re: Coolant Level

    No need to crush them in a Northstar. Just pop them in the radiator hose whole. DO NOT put them in the surge tank.

  16. #15
    Mountie's Avatar
    Mountie is offline Cadillac Owners Enthusiast
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    Re: Coolant Level

    When I replaced my Northstar, I upgraded my oil cooler to about twice the size ( same brand - same bolt install) .....Totally dry, I put in 10 quarts oil in the engine.

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