Question about 2004 Volkswagen Passat
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Posted on Jan 02, 2017
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
dead right it is ! the cover has not been resecured properly after changing oil +filter if garage says it waslike this on service why not tell you ?? either way take it back and complain this cover is secured by screws and no excuse for not fitting securely
Posted on May 02, 2009
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...
Posted on Jun 18, 2009
Check the fluid level in the resevoir. If it is low then top it up. However, it went low for a reason - maybe it's just because your brake pads starting to wear out or you could possibly have a brake fluid leak.
If your in any doubt have a pro check it out.
Posted on Oct 19, 2009
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Sep 29, 2015 | Volkswagen Cars & Trucks
It's sludge. Drop the pan drain the oil, clean the screen and the tube, flush the engine and use only fully synthetic oil. This is a hundreds of dollar repair but if you drive it as it is even for ten miles you'll need a new engine. This was an oversight by VW, recommending inadequate oil and it was covered under warranty but yours is out of warranty. It's been a month so you've probably already discovered all this. I can't believe no one in fixya told you right.
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