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997 low operating temperature

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My 2008 997 does not warm up in cool ,below 65 degree, temperature.

in weather below 50 degres it never reaches operating temp.The OBD indicates 

a problem with the thermostat. So i replaced the thermostat and housing two 

times without any change in the warm up characteristics.

The only solution was to block the heat exchangers in the front of the car.

With them blocked the engine warms to normal operating temperature.

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If the car is equipped with a Tiptronic gearbox, check the vacuum operated cooling watervalve to the Tiptronic heat exchanger. The membrane wants to leak vacuum after a while, such that the gearbox is always cooled instead of periodically when necessary, therefore the engine temperature remains too low. Follow the water pipes, from and to the exchanger, and you will come across the valve.    

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1 hour ago, Raylev911 said:

Where is the exchanger located?  Is it the exchanger in the center of the front. Between the two water heat exchangers?

thanks. I have been looking for an explanation for two years.  This is the first that makes sense.


It is on the side of the transmission, under the car.

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