Your Mitsubishi galante is overheating what could cause it to over heat?

a broad range of things.

A) simple one, check the water levels in the radiator and the header tank, MAKE SURE THE CAR IS COLD! if you open the radiator hot, bad news. lets hear it for third degree burns.

B) if its only running a little hot, try buying a bottle of radiator cleaner, run that through it and then try, if it fixes it, then maybe also add a bottle of anti-boil to your radiator.

C)check the thermo-fan is working?

D) if the car blows white smoke you make have a broken head gasket and water is leaking into the cylinders. this is bad. you need a new head gasket, a job that will set you back anywhere upwards of about $400, another symptom of a blown head gasket is the radiator doesn't visibly leak, but uses water.

E) check out the thermostat, if that's not functioning properly, then the water may not be flowing through the engine, also not great, though not as costly to get fixed.