Drain Coolant and Refill----No Need to Bleed Air From System?

Discussion in 'GM Powertrain' started by ibmoses, Dec 27, 2008.

  1. ibmoses

    ibmoses Rockstar 100 Posts

    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.

  2. retired

    retired Rockstar 100 Posts

    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. rotaryenginepete

    rotaryenginepete Rockstar ROTM Winner 100 Posts

    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.
  4. tlperry68

    tlperry68 Epic Member 5+ Years 1000 Posts

    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.
  5. ibmoses

    ibmoses Rockstar 100 Posts

    Thanks for the replies.

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

  6. ibmoses

    ibmoses Rockstar 100 Posts

    Tis done.

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

    Thanks for the replies.


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