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Administrator, Resident Tater Salad
17,598 Posts
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.

Trans cooler is a separate, standalone cooler - at least on US model Cruzens.

The oil cooler is a shared coolant/oil heat exchanger at the oil filter housing. THAT one might be a has happened before.
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