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  1. #1
    Active Member One Ring
    Join Date
    Feb 20 2025
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    1002443
    Location
    Alameda, California, USA

    2.8L Rear Engine Coolant Leak

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    My 1999 Avant developed a coolant leak a week ago in the most inconvenient place possible, the rear of the engine. Coolant is draining from block area onto transmission and puddling under the car on the drivers side, but no overheating issues; albeit, I'm not driving it too much. Initial thought was heater core return line, so I replaced it but still leaking. I bypassed the heater core itself to see if that would solve the mystery leak but it is still leaking. After a deep inspection, I believe it to be the inlet heater core line (feels/looks like the quick release clamp on engine side has failed). Coolant seems to be running from that hose along the main coolant pipe and getting everything wet, so it's a bit hard to tell. So, 2 questions - 1. what is the best approach to go in and remove / replace the heater core inlet line? After about an hour of reaching and coming at it from different angles, I can't seem to be able to reach it. 2. If the leak persists, what else can be causing coolant to drain onto the top of the transmission like this?
    Last edited by mledbetter717; 02-24-2025 at 02:31 PM.

  2. #2
    Veteran Member Four Rings Cybersombosis's Avatar
    Join Date
    Nov 13 2009
    AZ Member #
    50676
    Location
    Victoria, B.C., Canada

    So what exactly have you swapped out? Did you change the entire hose and quick connect on the driver’s side? Or just the hose? The quick connect does fail so you can just replace that part and stick it in the old hose.

    https://www.amazon.ca/URO-Parts-3B0-...1&gad_source=1
    2001.5 Audi A4 1.8TQMS - Brilliant Black on Black Onyx Sport Cloth
    Motoza Hybrid K04 Tune, FT F4-H, Bosch EV14 550cc, AEM Water/Meth Injection, Majesty FMIC, SSAC Cat Back Exhaust, Podi Boost Gauge, ATP Test Pipe, K&N air filter, HID fogs, eBay short shifter, Aero wiper kit, Eibach Pro-Kit springs, 18” B6 Ultrasport, Firestone Indy 500.
    2001 Audi S4 SRM K24 RS6 build

  3. #3
    Active Member One Ring
    Join Date
    Feb 20 2025
    AZ Member #
    1002443
    Location
    Alameda, California, USA

    So far replaced driver's side hose and quick connector. That's good to know I can just replace the quick connector rather than replacing the whole hose. Once I figure out how to pull out the inlet heater hose, I'll throw a new connector on it and see if that solves the leak.

  4. #4
    Veteran Member Four Rings Cybersombosis's Avatar
    Join Date
    Nov 13 2009
    AZ Member #
    50676
    Location
    Victoria, B.C., Canada

    Isn’t the inlet on the passenger side? Inlet is a different connector so make sure to buy the correct one.
    2001.5 Audi A4 1.8TQMS - Brilliant Black on Black Onyx Sport Cloth
    Motoza Hybrid K04 Tune, FT F4-H, Bosch EV14 550cc, AEM Water/Meth Injection, Majesty FMIC, SSAC Cat Back Exhaust, Podi Boost Gauge, ATP Test Pipe, K&N air filter, HID fogs, eBay short shifter, Aero wiper kit, Eibach Pro-Kit springs, 18” B6 Ultrasport, Firestone Indy 500.
    2001 Audi S4 SRM K24 RS6 build

  5. #5
    Active Member One Ring
    Join Date
    Feb 20 2025
    AZ Member #
    1002443
    Location
    Alameda, California, USA

    Yes the inlet is on the passenger side. I already replaced the outlet. Do you know the part number for the inlet connector or where I can find one that would work?

  6. #6
    Veteran Member Four Rings Cybersombosis's Avatar
    Join Date
    Nov 13 2009
    AZ Member #
    50676
    Location
    Victoria, B.C., Canada

    Check Amazon. Just make sure to look at the orientation of a part of ECS or something to make sure you get the right one.
    2001.5 Audi A4 1.8TQMS - Brilliant Black on Black Onyx Sport Cloth
    Motoza Hybrid K04 Tune, FT F4-H, Bosch EV14 550cc, AEM Water/Meth Injection, Majesty FMIC, SSAC Cat Back Exhaust, Podi Boost Gauge, ATP Test Pipe, K&N air filter, HID fogs, eBay short shifter, Aero wiper kit, Eibach Pro-Kit springs, 18” B6 Ultrasport, Firestone Indy 500.
    2001 Audi S4 SRM K24 RS6 build

  7. #7
    Active Member One Ring
    Join Date
    Feb 20 2025
    AZ Member #
    1002443
    Location
    Alameda, California, USA

    I appreciate the help, thanks!

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