We took it out to streets of willow, on the way up the car, started overheating, and pushing all the coolant into the reserve tank. When in the reserve tank it started boiling and trying to push out of the reserve. I let the car cool, and I checked the radiator, and it was low on fluid, so I filled it up and all was good for a second, then it started boiling again. and once the car was run on the track very lightly, same thing, the radiator would try to empty out, and push everything into the reserve. Trying to figure out what went wrong with it. The system was bled, fans kick on, People were saying head gasket, but I changed that less then 10000 miles ago. the bore on the head gasket is 89mm bore. The car is turbo right now. any help would be appreciated

can it be the radiator not flowing properly?

 

bad thermostat?

 

Bad Rad Cap?

The Mugen one increases the preassure to 1.3bar

 

Bad pump?

 

Bad Day!!!!

 

tried changing the radiator cap, Just recently changed the thermostat, Pump, I dont think so

 

Could it be backwards or upside down?

 

I will double check it, but I doubt it.

GReg

 

Bad fan switch

 

Headgasket is most likely suspect. There has been another FI S2k with a thick Cometic gasket blown.

Get a leakdown test done to confirm, a Gas analyzer probe placed over the radiator filler is a easy test, if you have the equipment.

You'll have higher HC's at the radiator than the tailpipe with a blown gasket.