Single-Function for Heavy-Duty Cooling
Connect a vacuum gauge to center port "D" of CTO switch. When coolant is below 220°F (104°C), carburetor ported vacuum should register. Above 220°F (104°C), manifold vacuum should be indicated.
Connect a vacuum gauge to center port "D" of CTO switch. When coolant is below 220°F (104°C), carburetor ported vacuum should register. Above 220°F (104°C), manifold vacuum should be indicated.