Help!!! Coolant leak through transmission

[quiqued]

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?


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[DeathTrap]

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 don’t remember if one is back there.


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[Will]

Is that coming from inside the bellhousing?

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

[quiqued]

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.

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[quiqued]

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 don’t remember if one is back there.


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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.

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[Will]

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.

[quiqued]

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?

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[Will]

How about the hoses that go from the radiator to the transmission?

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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).

[quiqued]

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?

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[Will]

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.