Question about 1999 Porsche 911 Carrera

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I have a 99 911. It overheats driving on side street but not on the freeway. I replaced the thermostat already. Water comes out from overflow reservoir?

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  • vrfeliciano May 07, 2010

    I believe all radiator fan works!

  • vrfeliciano May 07, 2010

    Yes! radiator fan turns on when the car is hot including the engine fan.

  • vrfeliciano May 07, 2010

    I will follow your suggestion! thanks

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When it gets hot does the fan on the radiator turn on? Because the airflow on the freeway is sufficiant enough to cool it down. So to me this says radiator fan.

Posted on May 07, 2010

  • dave taylor May 07, 2010

    Overheating can be caused by anything that decreases the cooling system's ability to absorb, transport and dissipate heat so heres what will cause overheating A low coolant level, a coolant leak (through internal or external leaks), poor heat conductivity inside the engine because of accumulated deposits in the water jackets, a defective thermostat that doesn't open but you said u replaced it, poor airflow through the radiator, a slipping fan clutch, an inoperative electric cooling fan, a collapsed lower radiator hose, an eroded or loose water pump impeller, or even a defective radiator cap. So i would go down the list of things and see what you can find. Thats all the things that cause overhteating,now its up to you for process of elimination. good luck and let me know what you find.

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