Thermal Vacuum Valve
Remove thermal vacuum valve from engine and place sensing portion in water heated to 120°F (49°C) or warmer. Blow through hoses connected to valve. Air should pass, indicating valve is open. If not, replace valve.
Remove thermal vacuum valve from engine and place sensing portion in water heated to 120°F (49°C) or warmer. Blow through hoses connected to valve. Air should pass, indicating valve is open. If not, replace valve.