Single-Function for Standard Cooling

When coolant temperature is below 149°F on 6 and 8 cylinder engines, or 120°F on 4 cylinder engines, the check ball is held against inner seat by spring tension. Manifold vacuum enters through port "1" and is applied through port "D". When temperature goes above specified limits, the check ball is moved up in the valve and manifold vacuum is applied from port "2" to port "D" on 4 cylinder engines, or carburetor ported vacuum is applied from port "2" to port "D" on 6 and 8 cylinder engines.