Pressure Cap Specifications

All models use a 16 psi (1.1 kg/cm² ) pressure cap which should be tested at 14-17 psi (1.0-1.2 kg/cm² ). Center of cap is equipped with a vent valve. Vent valve allows a small flow through the cap when temperature is below boiling point. Valve closes when boiling point is reached. Valve also opens when coolant is cooling and contracting, permitting liquid to return to radiator from coolant reserve tank.