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What is the best way to bleed/ burp the cooling system?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by saugus, Sep 27, 2011.

  1. Sep 27, 2011 at 4:51 PM
    #1
    saugus

    saugus [OP] Well-Known Member

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    I searched a little but couldn't really find any definite answers. I am concerned mainly because of this 50/50 super long life crap that I must use.:mad: Usually I just calculate the exact amount of 100% coolant and add it directly to the radiator and top off with water. By using 50/50, I now must ensure that the system is fully emptied including the heater core and hoses as well as the radiator and engine before I fill up. So the whole system will be empty when I reinsert the new thermostat causing a delay before the thing opens and circulates. So obviously I am concerned about steam pressure and the water pump.

    So anyway, I was going to just leave the cap off the radiator and turn the engine on while adding fluid as it circulated and waiting for air to escape. Am I right?:wave:
     
  2. Sep 27, 2011 at 5:03 PM
    #2
    wlmuncy

    wlmuncy Well-Known Member

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    fill up as normal. Then pull the truck to where the front is angled slightly higher than the back. Let it run while it's still cool and it will pull the mixture into it. Add more from there slowly and allow it to pull into the engine. Make sure you have the overfill at the minimum maker. Close the system off and drive normally. Get it to operational temperature and park at the same way. Let is cool and check it. You may need to do this last operational temperature/cool off a couple of times, but that will work all the air out of the system.
     
  3. Sep 27, 2011 at 5:09 PM
    #3
    saugus

    saugus [OP] Well-Known Member

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    Thanks, I will just jack up the front a few inches. But what about the radiator cap with the engine on? Off or on when burping? I assuming off.
     
  4. Sep 27, 2011 at 5:18 PM
    #4
    wlmuncy

    wlmuncy Well-Known Member

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    After the initial fill up with it running, keep it on during the run up to and cool down period. Once cool remove it. That will allow for the burping.
     
  5. Sep 27, 2011 at 5:29 PM
    #5
    PMK

    PMK Well-Known Member

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    FWIW, I just did a full drain, flush and reservice of the cooling system in my 2010 V6.

    The heater core will not drain well nor easily bleed air since the hoses run above the back end of the engine.

    If I were to do this again, I would disconnect the coolant hose splice above the left cylinder head. Have the heat selected full on. This is possibly there just for draining the heater core. There is no mention to accomplish this in the online oem manual I referenced.

    As for getting the air out, I would not bother with all the jack it up BS. Add coolant slowly, put the cap on the radiator, start the truck and idle for maybe 30 seconds, carefully squeeze the upper radiator hose to help purge the coolant. Give the throttle a couple of blips to maybe 3K, and then a steady 1800 > 2000 rpm for a few seconds. Let it idle for say 30 seconds, then shut it down. Make certain the temp is not warm enough to cause overflow at the radiator cap. Open the system and add more coolant. Service the catch tank to full. Check it after you drive a bit.

    Be forewarned, the hose on top and drain plug on the bottom of the coolant reservoir is now leaking. Thought I read somewhere here that you might need to smooth the plastic mold line flash with a blade to stop the leak. FWIW, my coolant reservoir and fan shroud was covered in the white powder. So I suspect this may be the coolant stink since new that warranty could not find.

    Best of luck with it.

    PK
     
  6. Sep 27, 2011 at 5:35 PM
    #6
    saugus

    saugus [OP] Well-Known Member

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    Thanks again.
     
  7. Sep 27, 2011 at 5:37 PM
    #7
    saugus

    saugus [OP] Well-Known Member

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    Way too much to absorb. I'll save this for Saturday when I do the job. :drunk:
     
  8. Sep 27, 2011 at 5:39 PM
    #8
    wlmuncy

    wlmuncy Well-Known Member

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    I agree on the running the heater on full blast to make sure the system is fully bleed. :) I prefer my method since I live on a hill and don't have much issue with the adjustment and touch a warm rubber hose does not sound fun to my paws.
     
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