Not really sure of the question but with every psi
that you increase in the system you raise the boiling
point 3*. There is 2 types of radiator caps 1 for
a resvoir(recovery style system and non resvoir)
and the easy way to tell if you have the resvoir cap
is, if you hold the cap up right there is a metal plate
dangling down, the non resvoir doesnt have it dangling