Question about 1999 Porsche 911 Carrera

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Porsche overheating & coolant loss through expansion tank

I have a problem with a Porsche carrera 911 V reg 3.4 can anyone help me please???

Water tempreture rises and the light comes on and sometimes goes off and water poors out of the expansion tank in the rear!!!...

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  • Anonymous May 04, 2009

    I have the same problem, I have replaced the cap twice and the preasure relief valve once and still have coolant being forced out of the expansion tank. I seems to happen mostly in warmer weather?

  • Anonymous May 16, 2009

    i have a 2003 boxster s that has the same problem anyone out there with a solution

  • Anonymous May 21, 2009

    porsche 964 runs hot when in traffic. never had this problem before.anny ideas?



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Check this out. Had the same problem. Easy fix. When you pull up at the lights does it blow steam everywhere as your water drips onto the exhaust. Next step is the water gets onto the coils engine light comes on and it mis fires!! Anyway solution. As it is doing it when you look at the bottom of the expansion tank you will see the water dripping. The tanks had a weakness and have I believe now been modified. Take it off and put your fingers over two of the three pipe holes, then blow down the other. Wifes often good at this!!! You will here a hissing as the tank has a pin hole in. It comes out fast as the pressure builds. To remove the tank undo the air box (1 x 10mm bolt and the screw on the large jubilee clip) Then undo the two petrol pipe bolts ensure your engine is cold. You should need a seventeen mm spanner. Then just under the engine lid you will see a 10mm nut which you need to undo. The box then slide forward toward the middle of the car and then back in a fastion!!! Give it a good blow you will see it. If you really must get in the bath with it and do it under the water.
Now get another and replace it.
Good luck everyone..... j 

Posted on Feb 13, 2010


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Posted on Jan 02, 2017

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SOURCE: Porsche carrera 911 1999 3.6 overheating problem!!!

either the expansion tank is just cracked or there is a head gasket problem.

Posted on Apr 12, 2010

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Water tempreture rises and the light comes on and sometimes goes off and water poors out of the expansion tank in the rear!!!...I replaced the thermostat already I used original parts. Could it be the...

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