Warm Open Test

6 Cylinder & V8 Engines

1. Ensure vacuum hoses are in good condition and properly routed and check engine coolant level.
2. With switch installed in its proper location, disconnect molded connector from valve and attach a 1/8 inch hose to bottom port of valve.
3. With radiator top tank warm to touch, but no warmer than 75°F, blow through hose. If it is not possible to blow through hose, valve is defective and must be replaced.