[4matic]

Is it possible to get ATF leaking into the cooling system with a Tiptronic transmission? From overfilling? A leak?



My cooling system is full of strawberry milk gook. It doesn't look like oil and the engine oil does not look milky.



The car runs perfectly.



Thanks



Steve

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[PorscheDude]

This is a new one for me? Does the the tip have cooling lines that run to the radiator?

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[968workaholic]

There is a heat exchanger inside the radiator that cools the tranis fluid in addition to the air cooler. Sounds like you have a leak and it is mixing the fluids. Change the radiator and flush the cooling system. It will take awhile to get all of the goo out of the block but it can be done. Make sure you change the thermostat too.

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[unknown4u]

I cant remember there is a heat exchanger inside. This because there is an external radiator in front of the car especially for the trani.

First thing tommorow is look underside the car.

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[4matic]

Thanks for the great help.



I took the car for a hard 125 mile run over MLK day and put it away warm. The fluid had been changed from synthetic to Dexron a few thousand miles ago (I like the "feel" of the Dexron better than the synthetic fwiw).



I ran the car hard again yesterday in a 160 mile jaunt to the ATT Peble Beach.



Today I find three leaks:



1. A small clear green coolant leak near the radiator.



2. A spot of clear red near the transmission vent.



3. The expansion tank looks like it is full of stawberry milk.



I have e chance to be ok.. The transmission never lost pressure until I took the radiator cap off. The atf fluid indicator in the back of the car was clear red and low until I took the radiator cap off. Now the tranny fluid reservoir in the back is overflowing...



I don't think water has gotten into the transmission yet? I'm thinking tow it in..



Steve



1992 968 Coupe Maritime blue Tiptronic 115k.

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[banditsc]

Definitely tow it, I would say the back is now overflowing because the pressurized coolant system is now pushing into the transmission system. Which could mean coolant headed into the transmission. I would definitely flush both the engine coolant system and the transmission really good.



Dont even start the start car up anymore...

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[968workaholic]

Not too likely that there is any tranis damage, but a flush wouldn't be a bad idea. The reason for having a heat exchanger in the radiator is for stop and go driving when there is no air flowing over the air cooler. If it weren't in the radiator then the fluid would cook in traffic, which is also when it gets the hottest. New radiator and a flush of the tranis and cooling system should be all that is required. Keep us posted with your progress.

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[4matic]

[quote name='968workaholic' post='47657' date='Feb 16 2008, 05:24 PM']Not too likely that there is any tranis damage, but a flush wouldn't be a bad idea. The reason for having a heat exchanger in the radiator is for stop and go driving when there is no air flowing over the air cooler. If it weren't in the radiator then the fluid would cook in traffic, which is also when it gets the hottest. New radiator and a flush of the tranis and cooling system should be all that is required. Keep us posted with your progress.[/quote]



Thanks!





Radiator $500 (the only one in California!) from Parts Heaven (I'm local to PH). Dealer item is 6 weeks from Germany $388 at Sunset.



r&r radiator, clean expansion tank, flush engine, check tranny fluid, and a new battery installd: $470.



Car runs great. A bit cooler than before.



I'll take back for another flush in a couple weeks





Steve

1992 Porsche 968 Maritime Blue Coupe 116K.

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[banditsc]

Sounds good. The extra flush is a good idea, water and bearings don't mix to well. Did the mechanic mention if there was an water in the oil that came out of the trans?

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[flash]

i am hoping you boiled out the radiator before installing it - a used radiator is often full of more deposits and junk than one that has been in service, because they don't seal them up to store them



also, next time, consider taking yours to a radiator shop and having the core replaced rather than buying a used radiator - frequently you can get a better core for less money, but it takes a couple of days

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[4matic]

[quote name='flash' post='47831' date='Feb 20 2008, 08:02 AM']i am hoping you boiled out the radiator before installing it - a used radiator is often full of more deposits and junk than one that has been in service, because they don't seal them up to store them



also, next time, consider taking yours to a radiator shop and having the core replaced rather than buying a used radiator - frequently you can get a better core for less money, but it takes a couple of days[/quote]





Radiator is factory new. Not oem and not used. Parts Heaven sells new parts and I'm only a mile away. $500 is fair for factory new. The Tiptronic radiator is $150 more than the manual version.



No water found in the transmission. I'm confident it is clean.



Tip learned: If your volt meter looks low. Time to change your battery! These cars need excellent

electrical power to run there best. We've found a few electrical shorts along the way and each time one is repaired the car runs noticeably better.

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[Dean]

I haven't been to the forum for a while so it was interesting to read this thread.



Last year I had exactly the same problem - a crack developed in the radiator heat exchanger causing the transmision to pump ATF fluid into the cooling system, in my case the ATF softened the rubber hoses and one of the heater hoses expanded & blew out, green coolant & red ATF went everywhere in the engine bay, what a mess.



4matic, keep an eye on your rubber hoses & check the heater hoses too (they're a bit hard to inspect) as ATF can soften and expand any rubber component not made to resist oil. I noticed the rubber seal on the thermostat had expanded to twice its size!



Whilst putting in a new radiator I decided to replace cam/balance belts & rollers whilst on the job, also decided to renew the water pump as it has a rubber seal, just as well as there was some wear in the bearings.



Glad to see you got your coolant/oil mix up fixed. by the way no water got into my transmision either.



Dean.

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