630CSi, 633CSi & 733i
With engine off and coolant temperature above 113°F (45°C), disconnect Red hose from Red switching valve and blow air into hose. Valve is good if air flows with ignition off and does not flow with ignition on.
With engine off and coolant temperature above 113°F (45°C), disconnect Red hose from Red switching valve and blow air into hose. Valve is good if air flows with ignition off and does not flow with ignition on.