@Seethaler posted:Thanks, it is a brand new cap from a US Pantera vendor and it holds pressure. When I open it and the engine is warmed up it releases air, but of course I don't know how much pressure it holds exactly.
A pressure testing kit will allow you to check it's capacity. You want 15 psi which likely it is not. Probably 12 psi.
I agree with JFFR as an "essential Pantera tool" but in all honesty the availability of these affordable kits is a relatively new development.
They just make the coolant level a non-issue instead of an epic trial of courage previously.