CVSCO & CCEVS

1. Check vacuum hoses for correct routing and valve installation. Check engine coolant level.
2. With valve installed, disconnect molded connector from valve and connect a 1/8 inch inside diameter hose to bottom port of valve.
3. With radiator top tank warm approximately 75° F, blow through hose.
4. If it is not possible to blow through the hose, replace valve.
5. Start engine and allow it to reach normal operating temperature. Connect a hand operated vacuum pump to bottom port of valve and apply 10 inches Hg vacuum to the valve. If vacuum drops more than 1 inch in 15 seconds, replace valve.