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Coolant Shutoff Valve replacement help needed

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I can clearly see water leaking from what I believe is the coolant shutoff valve, i.e. the valve on the driver's side of the tiptronic transmission that has a lever that i believe controls coolant flow to the transmission. Does anyone know the best way to go about removing and replacing this part? also if anyone has the part number that would be greatly appreciated.

1998 Tiptronic, recently replaced 2.5L with 2.7L after IMS fail, recently rebuilt transmission (damaged torque converter)

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A Tiptronic cooling water valve bypass (or continuously open valve) will drop the engine temp. by approx. 15° C. Not recommended by Porsche.

Thank you very much for the response. I would imagine that Porsche would not recommend such a practice but what would the mechanical implications be of running at such a reduced temp? Also how would such a measurement be taken? Would there be such a considerable effect on the hydraulic forces at work within the transmission given that cooling fluid that cools the ATF is the same fluid cooling the engine and as such gets heated up rather quickly? I.e. there seems to be a small window of time where the valve would be closed (I didn't buy a boxster to drive around the north pole. :P)

Also 15 degrees C is a rather large difference (60 degrees F.) I find that number hard to believe. Did you mean 15 degrees F? That would make a little more sense if speaking in terms of the range of temperatures (i.e. the mode in statistical terms of temperature readings.) Like I was saying the average operating temperatures would not seem to be hardly impacted at all.)

I am going to replace the part since the local dealer happened to have one in on hand and I'm $60 too impatient to wait for the same part from the OEM supplier off Pelican. It's $80 at the dealer $20 online.

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The values extend for the North European climate (the engine temp. gauge read approx. 70° C.) while driving with a bypass or defective, fully open valve, the car no longer meets the environment conditions over here. The Tiptronic cooling system is connected to the engine cooling system, depending the prevailing outside and gearbox temperatures, the valve opens and close for a longer or shorter time. Under winter circumstances and normal driving, the valve stays closed most of the time, but as said, it depend on the climatic conditions where you live.

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