SOURCE: oil in water resovour vw 2002 passat
This is probably a head gasket problem and not an oil cooler problem.
The oil cooler is fairly easy to test.
Remove the cooler from the engine but do not disconnect cooling lines and then pressurize the cooling system. You can use a radiator test tool to put pressure on the cooling system and look for leaks. If it leaks, replace it.
You may also be able to bypass the oil cooler altogether if it leaks.
The head gasket is another story.
Get a 1/4" pipe to spark plug fitting and put a male air coupling fitting in it.
Then you can charge the cylinders with air from your compressor.
Make sure each cylinder that you test is at top dead center so that the valves are closed.
If air bubbles into your coolant, you found your problem.
If air leaks out your intake you have a bad intake valve
If air leaks out your exhaust you have a bad exhaust valve etc.
If you find this useful, please take the time to rate it.
Tim
SOURCE: oil in water resovour vw 2002 passat
Could be just the OIL COOLER. VW IS CORRECT.
If the oil cooloer fails internely you will have a mix of coolant and oil. In the engine and in the Radiator,
But not to say the other guys were wrong...
SOURCE: Had water pump changed on 2003 Highline Jetta 1
sorry to be the messenger of bad news but from the symptoms described it sounds like the head gasket ,the oil feed to the camshaft to be more precise ,its forcing oil into the water circuit but the water is not getting into the oil because its at a lower pressure .
SOURCE: I've got oil in my coolant water on volkswagen
YOu may have to take it to a mechanic as the seals may need to warm up for the seals to expand and detect a leak
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