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  1. #1
    Active Member Two Rings
    Join Date
    May 04 2018
    AZ Member #
    418178
    Location
    Noblesville, IN

    Question Oil Cooler Replacement/Coolant Flush Question

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    Good afternoon Fellow Enthusiasts,

    I am looking to replace my oil cooler as well as flush my coolant. My question is, should i replace the cooler first or should i flush it first? *OIL COOLER IS FAILING CAUSING OIL IN COOLANT (shop analysis)

    I have so many things to do with this car but i feel like this is the first step i should take! Just dont know which way would be more efficient!


    Hope to hear back from you guys!

    Thanks!

  2. #2
    Veteran Member Four Rings Timtheguru's Avatar
    Join Date
    Dec 30 2009
    AZ Member #
    52711
    Location
    Seattle

    Replace the cooler first.. because if you don't and that's where it's mixing you'll have to flush twice..
    2001.5 S4 Sedan
    2002 A4 Avant 1.8t - Traded in
    2001.5 A4 1.8t - In storage rotting away providing homes for rodents
    2013 Q7 TDI

  3. #3
    Active Member Two Rings
    Join Date
    May 04 2018
    AZ Member #
    418178
    Location
    Noblesville, IN

    Quote Originally Posted by Timtheguru View Post
    Replace the cooler first.. because if you don't and that's where it's mixing you'll have to flush twice..
    Thanks! what i was thinking but wasnt 100% sure!

  4. #4
    Senior Member Two Rings
    Join Date
    Sep 19 2012
    AZ Member #
    100733
    Location
    Saint Clair Shores MI

    Oil cooler first. You need to drain the coolant anyways for the R&R.

    Sent from my SM-G930P using Audizine mobile app

  5. #5
    Active Member Two Rings
    Join Date
    Jan 01 2012
    AZ Member #
    86018
    Location
    Upper Mississippi Valley

    After the cooler is replaced, may still need to be flushed twice, depending on how much oil got in the coolant.
    B5 S4 | ~98% OEM |

  6. #6
    Veteran Member Four Rings zillarob's Avatar
    Join Date
    Nov 16 2010
    AZ Member #
    67118
    My Garage
    2kS4, 84gli, 84caddy dsl
    Location
    WetSide, WA

    Just do what you can now, but I hit it again hard in the summer when you dont have to worry about it freezing.

    And pray that crud dont get caught up in the heater core, if it hasnt already.
    There are only 2 things needed to make an Audi work properly - Duct tape and WD40. If it moves and it shouldn't - Duct tape. If it doesn’t move and it should - WD40.

  7. #7
    Veteran Member Four Rings
    Join Date
    Sep 24 2010
    AZ Member #
    64817
    Location
    Costa Mesa, SoCal

    Quote Originally Posted by bergtho View Post
    After the cooler is replaced, may still need to be flushed twice, depending on how much oil got in the coolant.
    Could be more than that. Might even be a good idea to replace the coolant reservoir because it's likely that it has become discolored from the oil.

    I'd suggest if you're in non-freezing temperatures to use only distilled water. After 2-3 flushes, then add coolant.
    2001.5 S4 Avant: JHM shifter, 3" exhaust, Stage 1, APR bipipe, lowered, receiving lots of love ($$$)

    2001.5 A4 1.8TQM: so many upgrades. Parting out.

    2001 Corvette (C5) Z06: just getting started



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