PorscheJack

Thanks for the comments guys. Some quick responses. The radiators and ducts are clean - the front end as been off the car twice this year, once to replace the radiators and onces to replace the cooling fan resisters. The "old" radiators were quite dirty - it looked like the car had driven into a mouse nest(I still rather wonder if a mouse didn't get in there when the car was in the shop for a week). However, even though the radiators were about half plugged, on the highway in hot weather, the temperature was only up about 1/2 of the digit "0" in 180. So when the radiators work, they seem to have lots of capacity. The Porsche shop forman came out to the track on the last DE and plugged in the Porsche code box and confirmed that both water temp and oil temp were high, so that rules out the temp guage. The oil to water "cooler" is new with the rebuilt motor, so it should be ok. (It looked new in the photos of the new motor). The transmission control valve that regulates transmission was also replaced (at my espense - as is most of the work - I think Porsche covered the thermostat). The suggestion of checking the oil lines is a good one, but given the number of times that the car has been on the hoist, I would have thought that the shop would have done that. Any other thoughts, especially on how to approach Porsche, would be welcome.

I have a 2000 Boxster S with Tiptronic. Two years ago, at 100k miles the motor failed at a Drivers Ed (DE) Event. Likely a cylinder wall "D chunk" failure as there was mixed oil and water, and oil coming out the exhaust. I had the car taken to the local Porsche dealer and installed a Porsche reman motor. The old motor had never overheated. The new motor has overheated at DE events quite consistently. I have had the engine temp light come on at one event (about 90 deg outside) and have stopped running at 250 degrees at other events. On the road, the temperatures are normal. Needless to say, this is a tough problem for the dealers, as they can't reproduce the problem in the shop. To date we have replaced the thermostat, the coolant bleeder valve (twice as it was leaking), all three radiators, the resisters for the cooling fans and the transmission bypass valve.The last event (late Sept) at 60 deg. outdoor temp, the motor was running at 225. The shop forman at the dealer came to the track and did confirm that the car was running hot (both water and oil) and that the fans (radiator and engine compartment) were operating properly. The dealer has said that he has no other ideas. I requested a replacement motor, but the Porsche rep. reportedly told the dealer that "he has seen Tiptronics overheat at track events" and has said Porsche will do nothing to deal with the problem. Two questions. Mine never overheated with the original motor. 1. Can any of you confirm that you do track events with a tiptronic and tell me how the temperature reads? 2. The warrantee on the motor runs out next week. Any suggestions on how to deal with Porsche or to escelate the problem? Comments appreciated.