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TM 5-4210-224-14&P
4-138. HEATER/DEFROSTER CONTROL ASSEMBLY REPLACEMENT.
This task covers:
a. Removal
b. Installation
INITIAL SETUP:
Tools
General Mechanics Tool Kit
General Safety Instructions
Engine OFF.
Transmission in (N) neutral.
Parking brake and micro-brakelock set.
Batteries disconnected.
REMOVAL
a.
Remove  knobs  (1)  from  heater  slide
controls and blower control knobs by pulling
firmly.
b.
Remove four screws (2) attaching the
heater control assembly (3) to the dash.
c.
Disconnect heater cable (4) and defroster
cable (5) at heater control assembly (3) by
removing retainers (6).
d.
Disconnect blower switch (7) from wiring
harness (8).
e.
Remove assembly through the opening.
INSTALLATION
a.
If a new unit is being installed, transfer the
blower switch (7) to the new unit.
b.
Install assembly through the opening.
c.
Connect blower switch (7) to wiring harness
(8).
d.
Attach heater cable (4) and defroster cable
(5) at heater control assembly (3) with
retainers (6).
e.
Align and affix heater/defroster control
assembly and bezel (3) to dash with four
screws (2).
f.
Install knobs (1) on heater slide controls and
blower control (3).
g.
Connect battery cables.
4-189

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