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Bleeding the cooling system

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    Bleeding the cooling system

    I just replaced the TB and WP on my 88 ix and bled the system as per instructions posted on the forum:
    Open bleeder screw.
    Pour coolant slowly into the overflow reservoir till it fills or coolant comes out of the bleeder screw - I stopped when overflow was full.
    Close bleeder screw, put cap lightly on overflow bottle and start the engine... Fan on fulll blast and full heat.
    Car starts on first go and idles great... When heat comes from vent, I start to bleed the bleeder screwand filling overflow bottle as needed.
    When bubbles stop coming from bleeder screw (ran car for 20min), closed bleeder screw and topped off the overflow bottle to mark and capped it.
    In running the car for 20min, never got past 1/2 mark and spit out good heat from vents.

    My question: as I am letting the car cool, I can tell by touch that the hose from the WP to tstat is empty (has a hollow sound when I tap it) and very pliable... Shouldn't this be full of coolant and moderately taut when I go to squeeze it?

    Thanks for any insight and/or assistance.

    Thank you

    #2
    Is your heat working properly?

    When I did mine the bleeder screw head snapped off. I just squeezed the hose on the system to help push air bubbles out. I get heat but my thermostat is either hot or cold. New housing in the spring.
    1989 325ix
    1992 325ic 770A
    2002 M3

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      #3
      if you get a steady stream of coolant from the bleeder screw and no more bubbling then your system "should" be air free -along with good heat from the system and providing your temp gauge isn't rising above half or there abouts. usually slightly below.
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