F 250 2WD Pickup V8-351 5.8L (1982)
Air Diverter Valve: Testing and Inspection
Normally Closed (Type 1) Solenoid Vacuum Valve
Note:
A type 1 solenoid vacuum valve is used in conjunction with a type 1 air cleaner temperature switch.
Procedure:
1. Start engine and allow to reach normal operating temperature. Make sure that ambient air around air cleaner is above 65° F.
2. With engine idling, disconnect vacuum hose to thermactor air bypass valve. Thermactor air should exhaust in atmosphere through exhaust ports in
end of valve silencer cover. Reconnect vacuum hose.
NOTE: Vacuum supply hose must always be connected to bottom vacuum fitting on solenoid vacuum valve.
3. Disconnect vacuum supply hose at solenoid valve, and check for vacuum by placing finger over end of hose. There should be vacuum with engine
idling. If not, check vacuum hose and vacuum source for leaks or obstructions.
4. Disconnect solenoid vacuum valve wiring connector and determine which terminal has 12 volts with ignition in the run position. Use a test light;
connect one end to terminal and other end to ground.
5. Connect wire with 12 volts battery voltage to solenoid vacuum valve. With engine idling, ground other exposed terminal on solenoid vacuum
valve to chassis ground. Thermactor air should not be dumped.
6. Reconnect wire disconnected in step 4 to solenoid vacuum valve. Thermactor air should not be dumped.
7. Replace solenoid vacuum valve if operation is not as specified in steps 5 and 6.
