Thx for guys comments.
I just found something new, i just drove the car and alomost hot the RED mark, I shut off the A/C and turn on the heat, the temp drop very fast, I suspect the thermostat or water pump got some problem. BUT, the stange thing is, the car does not have the water leak from water pump, hoses, bleeder valve, since last inspection on early July. I will get the service shortly, when my mech. receive the throttle cable, will fix it at once. I will let my mech focus on the thermostat.
Interesting thing is, I go thru other threads, some talked about the "00" or "01" coolant tank cap. Although mine is showing "01", I still buy a new (honestly, its chaep, give a try ^_^). The part no. on the cap shows "02" , but Porsche dealer sill calls it "01". I will change the cap tonite and keep you guys post!!!
