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  1. #1
    Join Date
    Jan 2018
    Grand Rapids, MI

    Default Coolant flush question

    Has anyone ever flushed their coolant? Thinking about doing it on my 04. 155k. Thought maybe it would make the heat stronger. By flushing i mean using a flush solution like prestone to descale the system. Just not sure if it's a good idea. I did this on the brake lines 2 years ago. The braking was much improved.
    04 Volvo XC70 5LT 143k "Floatey" Ruby Red, Valvoline 0W40
    07 Honda Accord V6 120k Silver, Napa 5W20 Blend
    07 Honda Accord L4 130k Bronze, Napa 5W20 Blend

  2. #2
    Join Date
    Feb 2010
    Virginia Beach


    I doubt it will make much difference unless the system was really neglected. The OEM coolant is good for ten years. I’ve had a couple of these apart, and never found even a hint of scale.

    Drain it - don’t forget the drain point on the back of the engine - refill it. You should be good to go.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (130K, Michelin AS4, HPL 0W40)
    2005 MB SL600 (58K Michelin AS4, Mobil 1 0W40)
    2004 V70R (147K, six speed M66, HPL 5W40)
    2004 XC90 (247K, HPL 0W30 Euro)
    2002 V70-XC (300K, HPL 0W30 Euro)
    2002 V70-T5 (230K, 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)

  3. #3
    Join Date
    Dec 2010


    I would never ever put any cleaner into my coolant system. Some of those "cleaners" can be aggressive to aluminum and instead of getting some benefit you will create a night mare. If you are concerned about heat output I think you should ask yourself a question what is the issue here? If you suspect that your heater core is plugged-replace it(just imagine that all the junk from plugged heater core goes around the system and plugs now your radiator, etc..) However unless you or previous owners were mixing/adding any different types of antifreeze or not distilled water-you should be good there. It is always a good idea to replace antifreeze periodically (not sure about 10 years unless it is some newer stuff with extra long life, but usually most services will recommend every 2 years or 30k). If you don't want to make your hands dirty, volvo dealer charges $185 for coolant flush. You want to save $130 then get a jug of oem concentrate and gallon of distilled water from any pharmacy and do it yourself. If you don't have dealer around-advance sells Pentosin brand antifreeze which is same as oem,just make sure you buy correct type.
    After flush(or before) get yourself a good infrared thermometer and compare temp at the vents with what your settings are. Also don't forget to clean a sensor inside climate unit). But at the end of the day-it is your car and your money.

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