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I have a 2000 Porsche 996 3.4 liter, (Over heating problem) I replaced the water pump it needed to be replaced, after installing the new one I test drove the car a few miles to bring the tempt up to 180 degrees everything seemed fine, I used the car the next day drove about 30 miles no problems until I was coming Home made it about 25 miles, before the car started to overheat about 230 degrees, Pulled over opened the Eng. Hood everything was wet from the Coolant Reservoir on down Added water made it home I thought maybe it could be the thermostat, Replaced it and new housing and gasket drained the coolant also Radiators both fans are working

but still overheating.

Any help will be greatly appreciated


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Ahsai's point is a good one, these systems will trap air unless you use a vacuum tool to fill the system.  I recently changed some hoses, but the system still had a couple of gallons of coolant in the pipes and radiators.  I used the vac tool to fill the remaining coolant and still had problems with air.  Finally after several top offs the system got happy again.


I know it's been mentioned, your condensers and radiators are clean?  I'd change the expansion tank cap.  What was the outside air temps and was it stop and go traffic? Have you checked your oil for any signs of coolant?

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The coolant reservoir cap would be a good start.  It's surprising how even a small pressure loss can bump up temperature. 


When I last filled re-filled my coolant I did it with the car pointing nose down with a difference front to back of about 300mm.  This helps if you don't have a vacuum tool.   

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Thank you for all your advice, I’ll try to answer everyone. No I did not use a vacuum tool to refill the coolant and yes it is an OEM water pump. The outside air temperature in the morning was about 62 degrees. Traffic was light on my way home, and the outside air temperature was about 85 degrees in stop and go traffic. As for any signs of oil in coolant no, I did take the advice from Hilux2400, I raised the back of my car and let it sit about 45-60 minutes. I also opened the bleeder valve and removed the coolant cap to see if any of the air would come up. It seemed to work, I was able to add another gallon of antifreeze and a gallon of water. I should have known something was wrong when it only took 4 gallons, 50% Porsche antifreeze and 50% water. Thank for all your help, no more over heating problems.

Thank You


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Hi Loren

Thank you for your response about the vacuum tool the video was a great help, all the people on this forum have been so nice and helpful. I can’t even begin to say how grateful I am, thank you RennTech.org

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