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2004 V6 4X4 ....HOW TO BLEED/REMOVE AIR BUBBLES FROM COOLING SYSTEM??????

Discussion in '1st Gen. Tacomas (1995-2004)' started by TacomaPilot2004, Feb 2, 2011.

  1. Feb 2, 2011 at 6:27 AM
    #1
    TacomaPilot2004

    TacomaPilot2004 [OP] Active Member

    Joined:
    Jan 26, 2011
    Member:
    #49974
    Messages:
    40
    Gender:
    Male
    Miami, FL
    Vehicle:
    2004 Tacoma V6 4x4 Crewcab
    Hello everyone,

    I have a 2004 Tacoma V6 3.4L 4x4 that has been giving me some random overheating problems, which basically have only happened while idling. After changing the t-stat and fan clutch, and confirming that revving at 1500RPM with the heater on DOES lower the temperature back to normal operating point, I believe, and HOPE that the only thing left to do is bleed out any air bubbles trapped in the system.

    I had a few suggestions to open up the radiator cap, turn the truck on, and when the coolant level drops, re-fill it. But everytime I've tried that, the coolant level almost immediately begins to overflow very slowly.

    Should I wait a few minutes and let it overflow?? Is this the normal way to do it? Is it supposed to overflow until the t-stat kicks in and then the coolant will drop???
     
  2. Feb 2, 2011 at 10:34 AM
    #2
    twfsa

    twfsa Well-Known Member

    Joined:
    May 29, 2010
    Member:
    #37997
    Messages:
    1,342
    Gender:
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    First Name:
    Tom
    Omaha Ne
    Vehicle:
    04 TRD 4X4
    881 Front coils, Bilstien 5100's all the way front set to "0" Icon Dynamic's mini leafs in rear, stock tires.
    Sure you don't have a head gasket problem, I changed my coolant drained the block and didn't have a air bubble issue.
     
  3. Feb 2, 2011 at 10:56 AM
    #3
    Graham

    Graham Pay it Forward

    Joined:
    Apr 8, 2009
    Member:
    #15723
    Messages:
    666
    Gender:
    Male
    Western New York
    Vehicle:
    2005 4x4 TRD Black V6 6 speed manual
    I had a heater core issue and resolved it by flushing my heater core and then bleeding the air out of the radiator. This was my final update post:



    Success!!!!!

    I flushed the heater core at lunch. I ran water through a garden hose through both lines about 4 times each till the water ran clear. Really wasn't to much discoloration. I then took off the radiator cap and put a funnel half filled with fluid in the radiator top and ran the engine for 20-30 minutes to get any trapped air out. As the fluid dropped I would add more to the funnel to keep it half filled. Once I stopped having bubble burps for 5 minutes or so, I removed the funnel and topped off the radiator.

    I turned it off and let it sit till the engine was cold then started it up and switched on the heater to warm the cab like on a cold morning. I went in the house for a sandwich and came back 10 minutes later and was met with nice warm air flowing through the vents. I am now ready for winter!

    Thank you all for your help! This forum is always a great resource for me and helps me avoid going to the dealership or local mechanic.

    Good Luck!
     
  4. Feb 7, 2011 at 7:03 AM
    #4
    TacomaPilot2004

    TacomaPilot2004 [OP] Active Member

    Joined:
    Jan 26, 2011
    Member:
    #49974
    Messages:
    40
    Gender:
    Male
    Miami, FL
    Vehicle:
    2004 Tacoma V6 4x4 Crewcab
    Hi everyone,

    Thanks for the input. I just now fixed the problem..FINALLY!!!

    So aparently, the lower radiator hose was very old and weak, and it had been collapsing due to the suction pressure from the water pump. I changed it out and it's now running great. Not a single sign of overheating. In fact, the needle seems to be even lower than the middle now!! :)
     
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