All Things Mk5 > How to Guides / Troubleshooting

Golf Gti mk5 DSG - Has Mayo in Expansion tank? something to worry about?

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Stupots:
What I was saying was that a new water pump can cause an oil cooler to fail if it was close to failing. If that is what has happened then changing the oil cooler will sort. Flush after the issue is fixed. It's not contamination from replacing the water pump itself as that is solely connected to the coolant system.

I'm not sure how big a job it is on the Mk5... somebody else would be able to advise.

LC5F:
I agree that new pump could be creating more pressure and push a near to failing cooler to fail.

Unsure how water pump replacement would create mayonnaise?
The water pump does not come into contact with oilways - I could understand an oil film forming in the header tank from the storage/anti-corrosion oil left on on the part - how bad was the mayonnaise? did you take a picture?

Usually coolers split internally, the cooler it is made up of thin alloy sheets separating oil from coolant.
Initially oil tends to push into coolant due to oil being at higher pressure than coolant.
Once its opened up it will continue to fail with the split opening up and coolant getting into oil may start to occur.

I would be keeping usage of the car down to minimum in case it fully lets go.
If you have to keep driving, scooping the mayo out and monitor closely to see if it returns.

ricky:

--- Quote from: LC5F on September 11, 2020, 08:35:31 pm ---I agree that new pump could be creating more pressure and push a near to failing cooler to fail.

Unsure how water pump replacement would create mayonnaise?
The water pump does not come into contact with oilways - I could understand an oil film forming in the header tank from the storage/anti-corrosion oil left on on the part - how bad was the mayonnaise? did you take a picture?

Usually coolers split internally, the cooler it is made up of thin alloy sheets separating oil from coolant.
Initially oil tends to push into coolant due to oil being at higher pressure than coolant.
Once its opened up it will continue to fail with the split opening up and coolant getting into oil may start to occur.

I would be keeping usage of the car down to minimum in case it fully lets go.
If you have to keep driving, scooping the mayo out and monitor closely to see if it returns.

--- End quote ---
It is my daily, so first i will clean out the tank. I have heard of short journeys can build crap in tank and see how it goes. Next will be the cooler replacement if it continues to happen. Thanks for your help.

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