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Thread: C5 Engine Coolant

  1. #1
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    Question C5 Engine Coolant

    Hi! I have a 2004 C5 that I bought in 2010. I'm sure it has never had the engine coolant changed. I want to get it flushed and refilled. I have asked a local auto service place and they don't use Dex-Cool. They say they haven't used it in GM vehicles for quite awhile. Went to my local Chevy dealer, yes they use Dex-Cool but "GM" doesn't recommend flushing system, just a drain and refill. So the questions are : Still use Dex-Cool (that's what is in it) and no need to flush system, just drain and refill?

  2. #2
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    Quote Originally Posted by UncleBuckNEO View Post
    Hi! I have a 2004 C5 that I bought in 2010. I'm sure it has never had the engine coolant changed. I want to get it flushed and refilled. I have asked a local auto service place and they don't use Dex-Cool. They say they haven't used it in GM vehicles for quite awhile. Went to my local Chevy dealer, yes they use Dex-Cool but "GM" doesn't recommend flushing system, just a drain and refill. So the questions are : Still use Dex-Cool (that's what is in it) and no need to flush system, just drain and refill?


    Drain and fill with Dex-Cool, correct. Good luck with it.
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  3. #3
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    Quote Originally Posted by LLC5 View Post
    Drain and fill with Dex-Cool, correct. Good luck with it.
    I agree, flush introduces some strong chemicals. I just dump the radiator & refill on all my cars. Check the % solution for your preference of boil/freeze protection & adj as needed.

    If it were mine I'd be putting some new hoses under the hood unless sitting on the side of the freeway waiting for a flatbed is your idea of a good time.



    If you want to really get crazy change the stat (they get lazy) and rad cap.
    Last edited by froggy47; 09-17-2013 at 03:59 PM.
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  4. #4
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    Sounds good. I was planning on having the hoses replaced. Drain and refill with Dex-Cool is it. Thanks!

  5. #5
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    Two weeks ago I drained and refilled w/DexCool on my '98......inc. new rad hoses, thermostat. The old coolant was still pretty clear and not "sludgie". My GM manual says the system is 12.5qts....I think....and I used 6 qts of new DexCool with distilled water only.

    Good luck!

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