Cadillac Eldorado mixed antifreeze and transmission fluid issue unresolved on Cadillac Eldorado

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Cadillac Eldorado owners report experiencing serious issues due to the mixing of antifreeze and transmission fluid, which can occur from a faulty transmission cooler. This mixture can lead to significant transmission problems, including delaminating clutches and damage to rubber components of the cooling system. Owners may identify this issue if they notice coolant and transmission fluid leaking, indicating a rupture in the radiator line, as these fluids should not normally come into contact. To resolve the problem, it is advisable to replace the radiator if an internal leak is detected. Additionally, regular maintenance checks and prompt attention to any leaks can help prevent further damage and costly repairs. Addressing this issue quickly is crucial to protect the transmission and cooling system from further harm.

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