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DRAFT
TB 9-2320-279-13-1
AC DOES NOT COOL OR COOLS INADEQUATELY - Continued
WARNING
Remove rings, bracelets, wristwatches, neck chains, and any other jewelry before working around
vehicle. Jewelry can catch on equipment and cause serious injury. Jewelry or tools may short
across electrical circuits or terminals and cause damage to equipment or severe burns or
electrical shock to personnel.
Wear protective goggles and nonleather gloves when servicing air conditioner system. Failure to
comply may result in injury to personnel.
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VISUAL INSPECTION
(1)
Shut off engine (TM 9-2320-279-10).
(2)
Remove eight screws and top heater cover
(3)
Remove four screws, lockwashers, washers, and
cover from AC heater/evaporator assembly
CAUTION: Slide temperature probe slowly from heater/
evaporator. Failure to comply may result in damage to
equipment.
(4)
Remove temperature control switch temperature
probe from evaporator core (WP 0044).
(5)
Remove four screws and pull center heater cover
aside (WP 0037).
(6)
Remove four screws and evaporator core cover
from AC heater/evaporator assembly (WP 0030).
(7)
Inspect AC evaporator core and system low-side
AC hose at AC evaporator core for excessive
sweating and frost.
(a) If AC evaporator core and system low-side AC
hose are not free from excessive sweating and
frost:
1. Recover R-134a refrigerant (WP 0050).
2. Replace AC expansion valve (WP 0030).
(b) If AC evaporator core and system low-side AC
hose are free from excessive sweating and
frost, recover R-134a refrigerant (WP 0050).
(8)
If removed, install evaporator core cover and four
screws on AC heater/evaporator assembly.
(9)
If removed, install center heater cover and four
screws.
(10) If removed, install cover and four washers,
lockwashers, and screws on AC heater/evaporator
assembly.
CAUTION: Do not puncture temperature probe. Failure
to comply will cause gas in tube to leak out.
NOTE: Slide temperature probe in AC heater/
evaporator slowly. Temperature probe must slide into
AC evaporator core until it touches the bottom of
insertion hole.
(11) Install temperature control switch temperature
probe in AC evaporator core.
(12) Replace AC condenser dryer (WP 0025).
(13) Evacuate and recharge system (WP 0050).
(14) Verify repair, go to Step 22 of this fault.
HEMAC183
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