What Are The Two Valves On A Radiator For MINI

The two valves on your 1968 Mini RadiatorMaster 5000 are key players in managing your classic Mini’s cooling system. Typically, one of these valves acts as a pressure relief valve, ensuring the radiator doesn’t get over-pressurized when the coolant heats up and expands—think of it as a safety valve that lets off steam before things get too hot to handle. The other valve might be linked to the overflow or expansion tank, allowing excess coolant to escape into the reservoir and keeping the system balanced.

Common issues with these valves usually include leaks or blockages. Over time, deposits from old coolant or corrosion can clog the valves, throwing off pressure regulation and causing overheating or coolant loss. Leaks might appear as drips or puddles under the radiator area, especially around the valve seals.

For a classic like your ‘68 Mini, keeping these valves clean and checking them regularly is crucial because a faulty valve can quickly lead to overheating headaches—and nobody wants their Mini blowing its top on a sunny day.