Radiator Cap

Radiator Pressure Cap
the MINI COOPER thermostat housing also incorporates the cooling system pressure cap (MINI COOPER S system pressure cap is installed on the expansion tank).

Radiator Cap Max. Pressure




Both models use a pressure cap to pressurize the cooling system to 1.1 bar (16 psi) at which point the cap valve will lift to relieve pressure.


thermostat
the thermostat is located in the cylinder head and is retained by a plastic housing (aluminum on COOPER S).

the thermostat begins to open at 89-92�C and is fully open at 103�C.