What they both said! :stupid: If the cap is leaking (ie, not holding pressure) then the system cannot pressurise, so the coolant will just expand with heat and then fill the expansion tank too much...
What they both said! :stupid: If the cap is leaking (ie, not holding pressure) then the system cannot pressurise, so the coolant will just expand with heat and then fill the expansion tank too much...
End of the gauge seems to be around 15-16psi when tested (there is a great thread on here somewhere which I'll try to find).
From what I've read normal boost is 9.7psi and about a third into the...