Page 1 of 4 123 ... LastLast
Results 1 to 10 of 33

Thread: Help!!! Coolant leak through transmission

  1. #1
    Join Date
    Jan 2014
    Location
    Miami, FL
    Posts
    20

    Help!!! Coolant leak through transmission

    Hi, I please need your help!
    A few month ago the car overheated and I finally decided to change the main parts of the cooling system at 145.000.
    I just changed radiator, expansion tank, expansion tank retainer and pipes, oil cooler thermostat, water thermostat, water pump with Stewart Components water pump, pulleys, belts and tensioners, upper and lower thermostat hoses, and filled with BMW blue coolant.
    There's no visible leak on any of the changed components or other hoses but there's a huge leak coming down the transmission bell.

    Any Ideas on what the problem can be?


    Sent from my SM-G986U using Tapatalk

  2. #2
    Coolant temp switch, heater core hoses and the plastic pipes under the intake manifold seem to be the only likely suspects. Maybe a freeze plug but I donít remember if one is back there.


    Sent from my iPhone using Tapatalk
    -Corey

    2003 Blue ZHP Sedan @ 210k
    Dead due to damaged valve. Parts are being transferred to a wagon:

    2003 325iT Japanrot 6MT @ 230k

  3. #3
    Join Date
    Nov 2017
    Location
    Irvine, CA
    Posts
    576
    Is that coming from inside the bellhousing?

    How bad was the overheat? These engines don't handle overheats very well.

  4. #4
    Join Date
    Jan 2014
    Location
    Miami, FL
    Posts
    20
    Quote Originally Posted by Will View Post
    Is that coming from inside the bellhousing?

    How bad was the overheat? These engines don't handle overheats very well.
    Yes from inside the bell.
    Pretty bad overheat but it was leaking before that but unfortunately I don't know exactly from where.

    Sent from my SM-G986U using Tapatalk

  5. #5
    Join Date
    Jan 2014
    Location
    Miami, FL
    Posts
    20
    Quote Originally Posted by DeathTrap View Post
    Coolant temp switch, heater core hoses and the plastic pipes under the intake manifold seem to be the only likely suspects. Maybe a freeze plug but I donít remember if one is back there.


    Sent from my iPhone using Tapatalk
    Coolant temp switch I just replaced too, heater hoses and pipes didn't but they don't show leakage.
    Looking on realoem I saw two freeze plugs/lids in the back of the head, a mechanic I know said thats the problem but he didn't inspect the car yet.

    Sent from my SM-G986U using Tapatalk

  6. #6
    Join Date
    Nov 2017
    Location
    Irvine, CA
    Posts
    576
    Any check engine light / codes?

    Maybe cracked block / cylinder head, or head gasket failed? There's nothing coolant related within the bell housing.

    Edit: just saw your post about the freeze plugs on the back... take off the cabin filter housing and feel around. If it's wet you've found the culprit.

  7. #7
    Join Date
    Jan 2014
    Location
    Miami, FL
    Posts
    20
    Quote Originally Posted by Will View Post
    Any check engine light / codes?

    Maybe cracked block / cylinder head, or head gasket failed? There's nothing coolant related within the bell housing.
    How about the hoses that go from the radiator to the transmission?

    Sent from my SM-G986U using Tapatalk

  8. #8
    Join Date
    Nov 2017
    Location
    Irvine, CA
    Posts
    576
    Quote Originally Posted by quiqued View Post
    How about the hoses that go from the radiator to the transmission?

    Sent from my SM-G986U using Tapatalk
    Those attach to the left side of the transmission.

    Sounds like you have an AT. The only things within the bell housing for an auto transmission are the flywheel / ring gear, and torque converter.


    The red tape is covering the in/out pipe connections:



    And from the parts diagram from RealOem (link).
    Last edited by Will; 05-03-2021 at 04:50 PM. Reason: add photo

  9. #9
    Join Date
    Jan 2014
    Location
    Miami, FL
    Posts
    20
    Quote Originally Posted by Will View Post
    Those attach to the left side of the transmission.

    Sounds like you have an AT. The only things within the bell housing for an auto transmission are the flywheel / ring gear, and torque converter.
    Can those hoses leak inside the transmission and get to where I have the leak?

    Sent from my SM-G986U using Tapatalk

  10. #10
    Join Date
    Nov 2017
    Location
    Irvine, CA
    Posts
    576
    Oh, maybe the hose / pipe leaking near the back of the motor and ingress into the bell housing via the starter-motor opening.

    Edit to add: the starter is where the chain is attached in the photo, above. There's that coolant hose that curves back towards the front in that area.

Page 1 of 4 123 ... LastLast

Similar Threads

  1. COOLANT LEAK BUT WHERE?
    By Smilez in forum Mechanical | Troubleshooting
    Replies: 3
    Last Post: 10-12-2016, 01:23 PM
  2. Weird coolant leak...
    By ecrabb in forum Mechanical | Troubleshooting
    Replies: 16
    Last Post: 06-25-2016, 11:02 PM
  3. Coolant Leak
    By san in forum Mechanical | Troubleshooting
    Replies: 42
    Last Post: 11-24-2014, 06:46 PM
  4. Coolant leak
    By Dave1027 in forum Mechanical | Troubleshooting
    Replies: 37
    Last Post: 04-27-2013, 11:24 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •