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  1. #1
    Jr. Mechanic ibmoses's Avatar
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    Default Drain Coolant and Refill----No Need to Bleed Air From System?

    My 03 Silverado 2WD with towing package has 78,000 miles so I figured it is time to service the cooling system.

    I was going to open the petcock on the radiator and drain the system and then refill with a 50/50 mix of coolant and distilled water.

    Is there no need to bleed the system after I drain/refill to remove air pocket(s)?

    Thanks for any tips or replies.

    Bert:out:

  2. #2

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    After you drain it you need to run it with the radiator cap off until it gets hot, that will let the air purge out of the coolant system.

  3. #3

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    Quote Originally Posted by retired View Post
    After you drain it you need to run it with the radiator cap off until it gets hot, that will let the air purge out of the coolant system.
    and make sure to keep filling the reservoir while its warming up and purging, keep the coolant topped off at the "HOT" mark on the reservoi. after its hot, turn engine off, cap the radiator, and the reservoir should slowly fill to the "COLD" mark as the engine cools.
    ROTARYENGINEPETE
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  4. #4
    Legend tlperry68's Avatar
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    Default

    I agree with pete. I don't believe there are any othe special procedures required The process he stated above is the same that I have followed on every motor I have ever flushed.
    Trevor - Huntington Beach, CA
    2007 GMC 2500 4X4

  5. #5
    Jr. Mechanic ibmoses's Avatar
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    Default

    Thanks for the replies.

    I jus now got through mixing up the 50/50 mix of Dexcool/Distilled water and will drain/refill tomorrow.

    Bert:out:

  6. #6
    Jr. Mechanic ibmoses's Avatar
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    Thumbs up Tis done.

    OK, that was pretty easy. It took just less than two gallons of the mixture.


    Thanks for the replies.

    Bert
    "Race Car Spelled Backwards is Racecar"

    03 Silverado 2WD extended cab 5.3 with towing package white/silver
    70GS455

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