400 L4-156 2.6L (1982)
Thermal Vacuum Valve: Testing and Inspection
1. Check vacuum hoses for correct routing and installation.
2. With valve installed, disconnect molded connector from valve. Connect a 1/8 inch inside diameter hose to bottom port of valve.
3. With radiator top tank warm (no warmer than 75° F), blow through hose. If it is not possible to blow through hose, replace valve.
4. Operate engine until normal operating temperature is obtained.
5. Connect a suitable vacuum pump and gauge No. C-4207 or equivalent, to bottom port of valve. Apply 10 inches Hg vacuum to the valve. If
vacuum level drops more than one inch in 15 seconds, replace valve.
