COMPRESSOR. - TM-5-4120-383-140239

TM5-4120-383-14

5-32.

COMPRESSOR.

The compressor and motor assembly are hermetically sealed in a

metal canister. The crankcase heater element, related parts, and

the electrical connector are attached to the canister externally

and may be replaced without opening the refrigeration pressure

system.

The compressor is located in the rear

(compressor/condenser) compartment. (See fig. 5-21.)

Disconnect input power to the air conditioner before

performing any maintenance to the electrical system.

Voltages used can be lethal. Shutting the unit off

at the control module does not disconnect power to

the compressor heater.

Inspect/Test.

Electrically test heater element, wiring

harness, and motor as follows:

(1)

Disconnect input power at its source.

(2) Remove top rear cover (para 4-11).

(3) Disconnect wiring harness by removing P10 from J10

(located on compressor junction box).

(4) Remove compressor junction box cover.

(5) Inspect internal wiring in compressor junction box to

ensure no wires are broken or grounded.

(6) Use a continuity tester or multimeter set on lowest OHMS

scale to check for continuity between pins G and F in

If there is no continuity between these pins,

connector J10.

heater is bad and should be replaced.

(7) Check continuity between pins D and E, if there is no

continuity between these pins and the compressor has had time to

cool down, the compressor motor internal overload switch (S8) is

bad, replace compressor.

(8) Check continuity between pins A and B, B and C, and A and

If there

C. There should be continuity between each pair of pins.

is no continuity the compressor motor is bad, replace compressor.

5-73