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  1. #1
    Join Date
    Aug 2017
    Location
    Marcellus, NY
    Posts
    99

    Default Air in cooling system?

    2003 XC70- I had a leaking intercooler hose (about 12” long, 2” diameter) so I drained off the radiator and replaced the hose. More of a pain than I expected!

    Seems like more coolant came out than I was able to refill, so I suspect maybe I’ve got some air in the cooling lines. There is a 1 ¼” (or so) hose that arcs up kinda high, looks like a perfect place to collect air in the system (and a perfect place for a little bleeder valve!) Is there a procedure for burping the air out of the system or does it do that burping automatically? I’ve tried squeezing that hose while engine is running (Res tank lid on). Maybe I just drive it to work with a bottle of 50/50 ready in the car and top it up at lunchtime?

    Thanks, Dave

  2. #2
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    4,116

    Default

    Multiple cycles of heat/cool work. I fill it up, then loosen that tiny hose from the radiator to the reservoir just a bit (this is just a little messy, you'll spill some...) so that the coolant gets up to that level. Top of the radiator.

    The system still has air in it, particularly in the upper radiator hose but when it's hot, I'll squeeze that upper radiator hose and try and work the air out.

    The best is to vacuum it and draw all the air out (this is the only method to fill the intercoolers on my MB S600). You'll need a kit like this: https://www.amazon.com/Radiator-Cool.../dp/B0081N522E
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (126K, Michelin AS4, HPL 0W40)
    2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
    2004 V70R (143K, six speed M66, HPL 5W40)
    2004 XC90 (235K, HPL 0W30 Euro)
    2002 V70-XC (295K, HPL 0W30 Euro)
    2002 V70-T5 (225K, IPD bars, Bilsteins)
    2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

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