Question about Volkswagen Passat
Vw passat oil in coolant resovour is oil cooler gone bad
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.
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Posted on Apr 15, 2009
This is not a head gasket problem, it's the oil cooler.
Water in oil= head gasket - will also overheat, bubbles in expansion tank and loss of water.
Oil in water = Oil cooler. You will also have with non of the above symptoms.
Don't wast hundreds of pounds having your head gasket canged, there is nothing wrong with it!
Posted on Dec 13, 2009
Might be transmission fluid in the antifreeze not engine oil in water. Could be a fault in the tranny cooler - only a one-way flow, so there is likely no coolant in the transmission. Might have to change the radiator.
Posted on Nov 14, 2014
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Posted on Jan 02, 2017
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