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2014 3.0 Cayenne Diesel EGR cooler internal leak

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I apologize if I have missed this topic in my searches.

I am waiting for my PIWISIII from Porschelibrarian so I don't have any  Porsche-specific electronic diagnostic capability yet.

The situation is this: I recently purchased a 2014 Cayenne Diesel with about 107,000 miles.

Carfax shows service at a Porsche dealer about every 5,000 miles, with a service at 105,736. The last service at 107,074 (oil change and general check). I have driven it about 150-200 miles so far and the current mileage is 107,530

Last week I got a "Check coolant level" warning on startup. I added a small amount of coolant (about a pint) and the warning went away. I assumed the coolant was green and slightly contaminated because there appeared to be a small amount of soot mixed into it. It was definitely NOT pink, yellow or orange.

The next day I got the same warning after driving about 1/2 mile.

When I opened the coolant tank, the coolant was overfull and frothy white.

The underside of the oil filler cap was normal looking, with a thin film of oil.

I parked the car. When I checked it the next day, the coolant was a few inches down from the top of the tank and was again a darkish liquid with no foam or froth visible.

When I next started the car, from cold, I had the coolant tank cap off. There was some movement of the fluid visible. After about a minute, I drove the car about two hundred yards down a mild grade and back up. When I looked in the coolant tank, there was a visible stream of frothy fluid starting to mix with the original, more normal looking fluid, and that frothy, creamy fluid started to mix and color all the fluid.

There were no bubbles showing at any point, other than the tiny ones of the foamy liquid.

I do not have any "check engine" or other warnings.The car runs smoothly at all RPMs and loads.

I suspect the EGR cooler has an internal leak.

I will do a vacuum test on the cooling system when I can get the car in the shop where I work on it ( the space has been taken over by a JD450 dozer) and possibly a test for combustion gases in the coolant.

The closest dealer is about 4 hours away, and the closest competent independent shop is about 2 1/2 hours away.

I'd welcome any thoughts on the situation and would like to know if anyone else has had any similar symptoms.

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Update so far: I got a tester for checking for combustion gases in the coolant and the result was positive. I had it hauled down to a dealer in the Denver area (Porsche of Littleton) which is the closest dealer (thank you AAA) where the earliest appointment was November 29th.

I'm pretty sure that what ever the issue is, it will be covered by the extended emissions warranty.

I'll post a follow-up when I know more.

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