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Forum Locked03 oil cooler - coolant contamination point?

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iguana View Drop Down
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  Quote iguana Quote  Post ReplyReply Direct Link To This Post Topic: 03 oil cooler - coolant contamination point?
    Posted: 07-Feb-2011 at 23:33
Has anyone torn their W8 oil cooler apart? I'm curious if the design has a way for coolant to get into the oil? Is there a physical route for the coolant to do that?

Searching online only gets me pictures of different VW oil coolers.
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  Quote markw8 Quote  Post ReplyReply Direct Link To This Post Posted: 14-Feb-2011 at 22:28
It looks as if it has 2 circuits, Oil and Water. If the cooler is damaged, there is a potential for the 2 to mix. VW states that you should change the oil cooler if there has been a failure that leaves metal in the engine/sump. If you suspect a problem, you could remove if and check it for signs of damage. You could also "pressure check" it to see if it is leaking. A radiator repair shop should have the necessary equipment. It costs £300 for a new one 07D 117 015J.
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  Quote iguana Quote  Post ReplyReply Direct Link To This Post Posted: 14-Feb-2011 at 22:40
Thanks Mark. I'm not sure if the cooler's damaged. My problems all started after temps dropped to -24f one night. My coolant has enough antifreeze to handle that, but that was the last day I drove it.

Do you know if there's a gasket in the W8 oil cooler that keeps water and oil separated or if the two fluids are in completely different sections? Just looking at it, it's a big block of Aluminum but I'll have to go look again to see how to remove it and see if I can see where the fluids go.
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  Quote markw8 Quote  Post ReplyReply Direct Link To This Post Posted: 14-Feb-2011 at 23:01
Oil cooler is a sealed unit which has the oil filter attached. If the water froze in the unit then it may have fractured internally. As it is a heat exchanger though, the oil itself would help as it has a low freezing point. Removing the oil filter may be enough to see if there is water in the unit.

Edited by markw8 - 14-Feb-2011 at 23:07
W8 owner Northampton, U.K.
Passat W8 Auto, Inky Blue, SatNav, Beige Leather, Sports suspension, solar roof, parking sensors, Nokia bluetooth.

W8 - not just a light cluster for Golfs
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