TM 9-4120-403-14
Test
(1) Using multimeter set on lowest OHMS scale, check continuity at pins F and G on P4 wiring harness plug.
Contacts should be closed when the surrounding temperature is above 50 (10 ). If there is no continuity, replace
F
C
thermostat.
(2) Tape the bulb of a thermometer to the thermostat, gasket surface. Use a blob of thermal mastic to improve
(3)
Place an ice cube to the face of the thermostat gasket surface.
(4)
When the temperature of the thermostat reaches approximately 50 (10 ) the contacts should open.
F
C
(5)
Remove the ice cube.
(6)
When the temperature reaches approximately 60 (160C) the contacts should close.
F
(7)
If the thermostat fails any of the above tests, replace thermostat.
Removal
(1)
(2)
(3)
Loosen two setscrews on hub of condenser fan.
(4)
(5)
Remove two screws in thermostat.
(6)
Remove thermostat, gasket and bracket.
(7)
Cut thermostat leads near thermostat body.
Installation
(1)
Splice thermostat leads (polarity is not important). See paragraph 4-47 for general wire repair instructions.
(2)
Secure bracket, thermostat and gasket with two screws.
(3)
Install condenser fan and key flush to motor shaft.
4-108