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Discussion Starter · #1 ·
As the title says, today I found traces of oil in the coolant expansion tank whilst doing my normal routine checks. I think I caught it early (if that makes a difference)

I have searched through the forum and cant seem to find anything, where do I start? what other checks to do? will a through flush and new coolant make any difference?

The coolant still got its color but you can see oil forming around the expansion tank

any help/advice is really appreciated.

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Caramel color Rust

Pictures were taken night time so not clear enough.
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Discussion Starter · #3 ·
Most likely cause is a leaking trans cooler (part within radiator).

No static test for this....I'd exchange the radiator pronto before the leak gets worse and allows coolant under pressure (at engine shut off) to push into the trans...........Actually, I think a trans flush would be wise in conjunction.

Rob
That makes sense.

I recently done (8 days ago) trans oil change but I made sure I didn't overfill, then all of the sudden this problem started. Is it possible that I may have overfilled it and this caused the issue?

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Discussion Starter · #6 ·
I think I may have found the culprit, one the lines going into the radiator has a leak. does the radiator need changing or it is just changing the lines?
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Discussion Starter · #8 · (Edited)
Your photo is where the trans cooler lines enter/exit the radiator.....a common external leak point, however I am referencing the cooler that is in the radiator.....what the lines are attaching to.
When it develops a leak it pushes trans fluid into the coolant......so, I still am of the mindset a radiator replacement (and likely cooler lines or line 'O' rings) may be in order.

Rob
Thanks for that mate. I am gana have to replace the radiator and cooler lines, flash the system and hope that solves it.

Can I remove the radiator without removing the A/C condenser (dont really want to touch it) front bumper and everything else in front of it? anyone wrote ho to tutorial?

Cant believe GM spare parts want £350 for the radiator alone!!
 
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