Grand Wagoneer V8-360 5.9L VIN 7 2-bbl (1989)
Thermal Switch
THERMAL SWITCH
1.
Disconnect the vacuum hoses from the thermal switch.
2.
Connect an hand operated vacuum pump to the vacuum source side of the sensor and a vacuum gauge to the vacuum motor side of the sensor.
3.
Apply 14 in. Hg vacuum to the switch.
4.
When the sensor temperature is below 95°F vacuum should be maintained.
5.
Warm the sensor to above 95°F. The air vent valve should open and decrease the vacuum to zero. Replace the switch if defective. The
temperatures listed are nominal switching values.
REVERSE DELAY VALVE
1.
Remove the vacuum hose from the end of the valve that is not black in color and apply an external vacuum of approximately 2-4 in. Hg.
2.
Using a stopwatch, note the time required for atmospheric pressure to pass through valve and eliminate the vacuum.
3.
Replace the valve if the time required to eliminate the vacuum is less than 4.5 seconds or more than 13.2 seconds.
4.
Install reverse delay valve with the black end toward the air valve vacuum motor.
