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  1. #1
    Active Member Three Rings Morritse's Avatar
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    May 08 2018
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    418437
    My Garage
    Stage 2 b8 a5 (sold)
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    Berkeley, CA

    Losing coolant. No leaks shown during pressure test. What could be happening?

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    About a week ago I took my front bumper off to install a lip, since then I've had to top off my coolant every couple days. Where is it likely leaking from, and what tests could I perform to figure this out?
    Last edited by Morritse; 08-11-2018 at 12:46 PM.
    Dual pulley e85 w/ TCU tune (EPL)
    Full custom exhaust (Catless)
    Brembo BBK
    APR CPS cooling system
    034 front and rear sway bars Transmission inserts, cr 15 bar strut brace, density control arms
    Koni sport shocks with Eibach lowering springs
    VMR v804 Wrapped in PSS (255/19/35)

  2. #2
    Active Member One Ring
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    Nov 19 2008
    AZ Member #
    35456
    Location
    San Antonio

    Sounds like it could be the lower radiator house. Maybe it backed off a little and just needs to be seated better.

    Really you just got to get under there and look. Maybe take some soapy water and spray it around to clean up any road gunk so you can see the leak better.

  3. #3
    Active Member Three Rings Morritse's Avatar
    Join Date
    May 08 2018
    AZ Member #
    418437
    My Garage
    Stage 2 b8 a5 (sold)
    Location
    Berkeley, CA

    Had it pressure tested... No leaks at all. Gonna keep an eye on it. Maybe it just got rid of a really big air bubble XD
    Dual pulley e85 w/ TCU tune (EPL)
    Full custom exhaust (Catless)
    Brembo BBK
    APR CPS cooling system
    034 front and rear sway bars Transmission inserts, cr 15 bar strut brace, density control arms
    Koni sport shocks with Eibach lowering springs
    VMR v804 Wrapped in PSS (255/19/35)

  4. #4
    Established Member Two Rings BucDan's Avatar
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    Jul 19 2017
    AZ Member #
    403220
    Location
    San Diego, CA

    Could be the PCV failing, especially if it doesnt stop after a week or 2.

  5. #5
    Veteran Member Four Rings theweebabyseamus's Avatar
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    May 12 2008
    AZ Member #
    28667
    Location
    Bay Area, CA

    Did you actually depressurize the system?

  6. #6
    Active Member Three Rings Morritse's Avatar
    Join Date
    May 08 2018
    AZ Member #
    418437
    My Garage
    Stage 2 b8 a5 (sold)
    Location
    Berkeley, CA

    Quote Originally Posted by BucDan View Post
    Could be the PCV failing, especially if it doesnt stop after a week or 2.
    Should I be losing coolant under a pressure test if this was the case?
    Dual pulley e85 w/ TCU tune (EPL)
    Full custom exhaust (Catless)
    Brembo BBK
    APR CPS cooling system
    034 front and rear sway bars Transmission inserts, cr 15 bar strut brace, density control arms
    Koni sport shocks with Eibach lowering springs
    VMR v804 Wrapped in PSS (255/19/35)

  7. #7
    Senior Member Two Rings Akvdubn's Avatar
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    Jun 28 2013
    AZ Member #
    118025
    My Garage
    2001 Imola B5 S4, 2005 Subaru STI, 1997 VW Jetta GLX, 2016 Triumph Daytona 675R
    Location
    Anchorage, AK

    Quote Originally Posted by Morritse View Post
    Should I be losing coolant under a pressure test if this was the case?
    Might be a pretty slow leak. If you have time maybe pressure test and leave it on overnight and check the pressure in the morning

    Sent from my LG-H820 using Audizine mobile app

  8. #8
    Active Member Three Rings Morritse's Avatar
    Join Date
    May 08 2018
    AZ Member #
    418437
    My Garage
    Stage 2 b8 a5 (sold)
    Location
    Berkeley, CA

    Quote Originally Posted by Akvdubn View Post
    Might be a pretty slow leak. If you have time maybe pressure test and leave it on overnight and check the pressure in the morning

    Sent from my LG-H820 using Audizine mobile app
    It isn't a slown leak... At least under normal circumstances. Have to fill up every day almost.
    Dual pulley e85 w/ TCU tune (EPL)
    Full custom exhaust (Catless)
    Brembo BBK
    APR CPS cooling system
    034 front and rear sway bars Transmission inserts, cr 15 bar strut brace, density control arms
    Koni sport shocks with Eibach lowering springs
    VMR v804 Wrapped in PSS (255/19/35)

  9. #9
    Senior Member Two Rings Akvdubn's Avatar
    Join Date
    Jun 28 2013
    AZ Member #
    118025
    My Garage
    2001 Imola B5 S4, 2005 Subaru STI, 1997 VW Jetta GLX, 2016 Triumph Daytona 675R
    Location
    Anchorage, AK

    Quote Originally Posted by Morritse View Post
    It isn't a slown leak... At least under normal circumstances. Have to fill up every day almost.
    If it's nothing visible, then probably either pcv or intercooler leak

    Sent from my LG-H820 using Audizine mobile app

  10. #10
    Active Member Three Rings Morritse's Avatar
    Join Date
    May 08 2018
    AZ Member #
    418437
    My Garage
    Stage 2 b8 a5 (sold)
    Location
    Berkeley, CA

    Quote Originally Posted by Akvdubn View Post
    If it's nothing visible, then probably either pcv or intercooler leak

    Sent from my LG-H820 using Audizine mobile app
    Any way to check if it's PCV besides pulling the blower off?
    Dual pulley e85 w/ TCU tune (EPL)
    Full custom exhaust (Catless)
    Brembo BBK
    APR CPS cooling system
    034 front and rear sway bars Transmission inserts, cr 15 bar strut brace, density control arms
    Koni sport shocks with Eibach lowering springs
    VMR v804 Wrapped in PSS (255/19/35)

  11. #11
    Veteran Member Four Rings theweebabyseamus's Avatar
    Join Date
    May 12 2008
    AZ Member #
    28667
    Location
    Bay Area, CA

    Quote Originally Posted by Morritse View Post
    Any way to check if it's PCV besides pulling the blower off?
    Pull your oil cap when the vehicle is running and itíll be tough to get the cap off.

  12. #12
    Active Member Three Rings Morritse's Avatar
    Join Date
    May 08 2018
    AZ Member #
    418437
    My Garage
    Stage 2 b8 a5 (sold)
    Location
    Berkeley, CA

    Quote Originally Posted by theweebabyseamus View Post
    Pull your oil cap when the vehicle is running and itíll be tough to get the cap off.
    I thought it was a different part of the PCV failing which caused this sort of symptom. There was some slight suction. Really not too hard to get off though.
    Last edited by Morritse; 08-11-2018 at 05:25 PM.
    Dual pulley e85 w/ TCU tune (EPL)
    Full custom exhaust (Catless)
    Brembo BBK
    APR CPS cooling system
    034 front and rear sway bars Transmission inserts, cr 15 bar strut brace, density control arms
    Koni sport shocks with Eibach lowering springs
    VMR v804 Wrapped in PSS (255/19/35)

  13. #13
    Active Member Three Rings Morritse's Avatar
    Join Date
    May 08 2018
    AZ Member #
    418437
    My Garage
    Stage 2 b8 a5 (sold)
    Location
    Berkeley, CA

    Turns out it was the fucking coolant resivoir. Cracked underneath the metal heat shield on the left side of the resi so I couldn't see shit.
    Dual pulley e85 w/ TCU tune (EPL)
    Full custom exhaust (Catless)
    Brembo BBK
    APR CPS cooling system
    034 front and rear sway bars Transmission inserts, cr 15 bar strut brace, density control arms
    Koni sport shocks with Eibach lowering springs
    VMR v804 Wrapped in PSS (255/19/35)

  14. #14
    Veteran Member Four Rings jygesq's Avatar
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    Aug 22 2014
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    277067
    My Garage
    1986 Honda CH 150 D scooter bought new
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    bloomfield,ct

    Quote Originally Posted by Morritse View Post
    Turns out it was the fucking coolant resivoir. Cracked underneath the metal heat shield on the left side of the resi so I couldn't see shit.
    That is an easy fix! You are very lucky.
    2015 S4, P+, Florett Silver,black /silver nappa leather, S-tronic ,sport diff,B&O ,tech package ,supercharged badges. All season tires ,cargo net, factory dip stick

  15. #15
    Active Member Three Rings Morritse's Avatar
    Join Date
    May 08 2018
    AZ Member #
    418437
    My Garage
    Stage 2 b8 a5 (sold)
    Location
    Berkeley, CA

    Quote Originally Posted by jygesq View Post
    That is an easy fix! You are very lucky.
    Yeah, super relieved!
    Dual pulley e85 w/ TCU tune (EPL)
    Full custom exhaust (Catless)
    Brembo BBK
    APR CPS cooling system
    034 front and rear sway bars Transmission inserts, cr 15 bar strut brace, density control arms
    Koni sport shocks with Eibach lowering springs
    VMR v804 Wrapped in PSS (255/19/35)



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