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Thread: 98 Concours coolant question???

  1. #1
    iruleyounow's Avatar
    iruleyounow is offline Cadillac Owners Fanatic
    Automobile(s): RIP 01 Deville 69k Current:1998 Concours 60k
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    Cool 98 Concours coolant question???

    Getting my car ready for colder weather ahead of time.

    Now when i bought my car, it had the green coolant, and i would like to switch it to factory Dex (UNLESS YOU GUYS DISAGREE)!

    My question is, would i have to do a flush?

    Ive seen on here a lot, that its not good to mix the two.

    So would a drain and fill suffice? Or would i need to flush the system?

    Car has 60k on it, and i honestly don't think a flush was done when the green was put in. But i have no idea when it was switched.

    Or should i just not switch back?

    I cannot remember who said it on here, but they said to never switch back????

    Or maybe i read that somewhere???

    Lol my mind is fried, TOO MUCH COLLEGE HOMEWORK!!!

    Thanks guys!!!


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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 98 Concourse Coolant Question???

    Stick to good ol' Green Goddess. Drain what you can, using the lower driver's side radiator draincock, check the water pump drive, particularly the tensioner pulley, for quiet operation. Refill with a 50/50 mix of new coolant. Every 3 years. Maintain coolant at the proper level.

    DEX-COOL (orange coolant) is good stuff and is a "5 year" coolant. Problems arise because it is a long-life coolant and most drivers expect the car to tell them when to fill or check something, it gets neglected, loses its acid neutralizer strength, and the cooling system begins to corrode. Simple weekly underhood checks and maintenance would prevent 75% of the questions in CF.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 98 Concours coolant question???

    Quote Originally Posted by iruleyounow View Post

    I cannot remember who said it on here, but they said to never switch back????
    You CAN switch back, but doing so doesn't accomplish much as the system is coated with silicates (from the green coolant) and supposedly you loose the "long life" capability of Dex-Cool, which was a bad idea in the first place. Follow Sub's advice and change it every 2-3 years, no matter what you use. If you do decide to switch, it would not be a bad idea to flush it, but remember, you cannot get all the water out after a flush so you'll have to compensate to get a 50/50 mix.

  5. #4
    iruleyounow's Avatar
    iruleyounow is offline Cadillac Owners Fanatic
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    Thanks a bunch guys! I'll just stick to the green. Seeing as it's way cheaper!

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 98 Concours coolant question???

    FWIW, almost all "green" and HD diesel "purple" coolant is now either "no" or "low" silicate formula, as suspended silicates (microscopic sand) tended to eat water pump seals. Look on the coolant jug - it WILL say "No silicate formula" or "Low silicate formula" somewhere, maybe in the fine print.


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