ok i just got the motor back in I put all new gaskets on it, had the head checked for warpage and it was good. well now it wants to start overheating. I replaced the thermostat thinking that would fix it but it didnt the waterpump builds up pressure and everthing is good no leaks or nothing but it still overheats. could someone please help me.thanks.

 

blocked radiator, bad rad cap, bad temp sensor, air in the system?

 

just flushed the radiator, its got a brand new z32 radiator cap, and i bled the whole system. at first i thought that it was just the temp sensor but when i turn the car off the over flow tank shoots coolant out really fast.

 

wrong head gasket maybe?

 

Are you fans kicking on? What kind of fans u using?? Are they pushing or pullers? also how long does it take to over heat? Does it get to normal operation temp then just spike or slowly keep raising?