TM 9-4120-403-14
Test
(1) Disconnect P3 from J3 (located on the compressor junction box).
(2) Test crankcase heater. Using multimeter, test resistance from pin F to pin G. Resistance should be
approximately 400 to 450 ohms. A much lower reading indicates short, an infinite reading indicates an open. Replace
(3) Test compressor motor windings:
should exist. If continuity exists, the compressor is bad. Replace compressor.
(b) Using multimeter, test resistance at J3 between pins A to B, B to C, A to C. All resistance should be above
s
zero and less than 2 ohms. If resistance is zero or greater than 2 ohms, replace compressor.
(4) Test motor thermostat.
closed. An infinite reading indicates an open. Replace compressor.
Figure 5-23. Compressor Replaceable Items
5-75