could a bad/old radiator cap cause semi-overheating problems? ive tried everything else already, check for leaks, bleed the system again, made sure the fan worked, ive done it all. its starts to semi-overheat at crusing highway speeds.

what does the radiator cap do? what do i look for when buying a new one?

 

just go to autozone and pick one out? is there anyway by just looking at my current radiator cap to see if its bad?

 

just go to autozone and get one. just tell them the make and model and blah blah blah