whats the best way to determine that my head gasket is blown???
the reason i asked is i only blow smoke when i stop and the car overheat when its really hot out and also when i drive over 80mph...
anyone here have any ideas???
its also turbocharged by still in the process of breaking in a rebuilt motor...

 

and also the fan does work cause i checked and i'm running a new fluidyne radiator!!!!