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'99 OVERHEATING SLIGHTLY?

aracerx
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aracerx Member

aracerx

Posted
Posted

This car is odd in that temp rises to about 195F and tends to stay there. I've checked with PIWIS and fans can be operated through the tester-low and high, yet the fans do not kick in over 180 degrees. the ECU sends the signal to the fan relays so I'm a bit confused. Coolant level is ok and engine performs fine. Temp is accurate according to PIWIS. Cleaned radiators of debris also

1999Porsche911 Member

1999Porsche911

Posted
Posted (edited)
This car is odd in that temp rises to about 195F and tends to stay there. I've checked with PIWIS and fans can be operated through the tester-low and high, yet the fans do not kick in over 180 degrees. the ECU sends the signal to the fan relays so I'm a bit confused. Coolant level is ok and engine performs fine. Temp is accurate according to PIWIS. Cleaned radiators of debris also

The normal and targeted temperature of your engine is 195F. Your engine will and should never run at 180F. If you do a search, you'll find lots of info on coolant temperature. Your slow speed fans will not kick on unless the AC is on or the coolant temperature reaches slightly more than 200F. High speed fans will not kick on until you are above 215F or you have excess pressure in the AC system. Your engine will not run at 195F except under optimal conditions, including proper airflow through the radiators. During slow driving, you will likely see 215F+ coolant temps.

Do not rely on the idiot gauge to display accurate coolant temperature.

A search will also show you how to test the fan relays.

Edited by 1999Porsche911

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