Question about 2001 Volkswagen Passat
There is a very easy way to check the oil cooler for leaks.
Do this with the engine cool and be prepared to catch some coolant in a pan.
Remove the 2 coolant hoses from the oil cooler and attach them together using a 5/8 inch straight heater hose connector. You are bypassing the oil cooler temporarily. Wipe the oil cooler clean so you can clearly see any leaks develop.
Now run the engine and watch the oil cooler pipes (the ones you just removed the hoses from) carefully. If you begin to see oil seeping from the cooler pipes you've found your problem.
This might take a while to see so be patient and let the car run for at least 15 mins or more.
Don't worry about the cooler being disconnected while the car is running, but I do recommend reconnecting the cooler if you have to drive it even if you find it to be leaking.
If it is found to be leaking, you will need to replace the part and have your coolant flushed out properly to remove as much of the oil as possible from the system. Also change the engine oil at the same time, it is possible that coolant has gotten into the oil although it may not be obvious.
Posted on Jan 31, 2010
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Posted on Jan 02, 2017
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