W150 1/2 Ton Pickup 4WD L6-225 3.7L VIN E 1-bbl (1982)
Thermal Vacuum Valve - Carb: Testing and Inspection
1. Check vacuum hoses for proper routing and make sure that valve is properly installed. Also make sure that engine coolant is at proper level.
2. Disconnect molded connector from valve and connect a 1/8 inch inside diameter hose to bottom port of valve.
3. With engine coolant at 75° F or less, blow air through hose. If air does not flow freely, replace valve.
4. Start engine and warm to normal operating temperature, then using an external vacuum source, apply 10 inches Hg to valve. If vacuum level drops
more than one inch in 15 seconds, replace valve.
