how to fill radiator??

Discussion in 'Maintenance' started by Numatik, Jan 28, 2012.

  1. Numatik

    Numatik GMFS Member

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    Hey guys,

    Im changing out a water pump on my 04 silverado with the 4.3l. This is the first time I have seen a radiator without a cap, how do I fill this? It does have an overflow tank, then has a very small line from the top end of the tank to the radiator. What should I do?
     
  2. Explorer_BigJon

    Explorer_BigJon GMFS Member

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    Here is the Drain and Fill directions,

    Water pump
     
  3. tylers88

    tylers88 Multiple GMFS owner

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    I did the water pump on my 04 with a 5.3 and I have a cooling system bleeder funnel. It screws onto the factory cap location and makes it the high point, fill it from the overflow tank and it will fill the radiator. I would suggest getting one of those funnels, you run it until its at operating temp and let the air bubble out. I Bleed the system took it for a 10 mile drive at 60 mph parked it let it cool down and checked it.
     
  4. bigblue4x4

    bigblue4x4 GMFS Member

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    the 4.3 is different from the 4.8,5.3,6.0L motors but basically the same when filling the cooling system up

    fill the overflow until its full,let it sit for 5min
    top off again
    start the engine and add coolant as it drops
    go for a drive until its fully warmed up
    top off the coolant bottle
    when the motor is cool top off the overflow bottle again
    check the next day and top of if needed
     
  5. Numatik

    Numatik GMFS Member

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    Thanks! This did it!
     

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