HEATER THEMOSTAT. (Cont)

TM5-4120-383-14

4-34.

HEATER

THERMOSTST.-Continued

(8) Repeat step (7) with meter connected to terminals 3

and 4.

(9) Tape the bulb of a thermometer or junction of a

thermocouple to the body of the heater thermostat, and connect the

multimeter to terminals 1 and 2 . Use a 150 watt lamp bulb or a

heat source. Gradually apply heat while observing both the

thermometer and the multimeter. Continuity should drop out at 145

to 155F (63 tO 68C). Remove heat source and let the thermostat

cool while observing the thermostat and multimeter. Continuity

should be re-established at 100 to 120F (38 to 49C).

(10) Repeat step (9) with meter connected to terminals 3

and 4.

Replace.

Replace heater thermostat if defective.

Installation.

(1) See tags and wiring diagram figure 4-4 and connect leads.

Remove tags.

(2) Attach thermostat to bracket with two screws and lock

washers.

(3) Attach thermostat and bracket assembly to flange of the

top center cover with two screws.

(4) Install top front cover (para 4-11).

(5) Connect power at power source.

HEATER ELEMENTS.

4-35.

The heater elements are located in the upper front compartment

behind the evaporator coil.

Disconnect input power from the air conditioner

before performing maintenance on any part of the

electrical system. The voltages used can be lethal.

Inspect/Test.

(1) Disconnect power at power source.

4-95