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3.25. Power (Switch #2,) and Heat-Vent-Cool
Switch (Switch #3).
a. Removal.
(1) Disconnect power to unit.
(2) Refer to figure 3-2 and disconnect control
knob.
(3) Refer to figure
3-6 and remove the
evaporator front panel.
(4) Refer to figure 3-6 and remove the control
panel.
(5) Refer to figure
3-9 and disconnect
switches from the control panel.
b. Test.
(1) Power Switch (Switch # 2).
(a) Place switch in the ON position,
(b) Touch the probes of a multimeter to
terminals 2 and 3, 5 and 6, 8 and 9, and 11 and 12.
Each pair of terminals should indicate continuity, if
the terminals do not indicate continuity, the switch
is defective and should be replaced.
(2) Heat-Vent-Cool Switch (Switch # 3).
(a) Place switch in the COOL position.
(b) Touch probes of a multimeter to
terminals 2 and 3, 5 and 6, 8 and 9, and 11 and 12.
Each pair of terminals should indicate continuity.
(c) Place switch in HEAT position.
(d) Touch the probes of a multimeter to
terminals 1 and 2, 4 and 5, 7 and 8, and 10 and 11.
Each pair of terminals should indicate continuity.
If the terminals do not indicate continuity as
outlined above, the switch is defective and should be
replaced.
c. Installation.
(1) Refer to figure FO-1 and secure wires to
terminals of switch.
(2) Refer to figure 3-9 and install the power
switch and heat-vent-cool switch.
(3) Refer to figure 3-6 and install control
panel and evaporator front panel.
(4) Refer to figure 3-2 and install control
knob.
3-26. Air Supply and Discharge Louver Control
Switch [Switch #1)
(2) Refer to figure 3-2 and remove the louvei
control knob.
b. Cleaning and Inspection.
(1) Clean the louver control assembly with an
approved cleaning solvent and dry thoroughly.
(2) Inspect for breaks, cracks, bends, loose or
missing mounting hardware, damaged cable, or
other defects.
(3) Replace a damaged or defective louver
control as necessary.
c. Installation.
(1) Refer to figure 3-2 and replace the louver
control knob.
(2) Refer to paragraph 3-8 and connect the
bell crank louver control cable to the louver.
3-27. Power Relay
a. Removal.
(1) Refer to figure 3-1 and remove evaporator
top panel and top left side panel.
(2) Refer to figure 3-10 and remove power
relay.
b. Cleaning, Inspection and Testing.
(1) Wipe the relay with a clean, dry cloth.
(2) Inspect for breaks, cracks, corrosion, rust,
loose electrical connections, or other defects. Check
mounting screw on relay for tightness to socket
base.
(3) If relay is tight in socket and does not
function, remove relay from socket and test pin
numbers 6 and 7 for continuity, see paragraph 3-
32 b.
(4) Replace a damaged or defective relay as
necessary.
c. Installation.
(1) Refer to figure 3-10 and align the pins of
the relay to be installed with the sockets in the
mounting base and insert pins, pressing element
firmly into the base.
(2) Refer to figure 3-1 and replace evaporator
top panel and top left side panel.
a. Removal.
(1) Refer to paragraph 3-8 and disconnect the
bell crank louver control cable from the louver.
3-21
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