AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

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

(WP 0037).

(3)

Remove four screws, lockwashers, washers, and

cover from AC heater/evaporator assembly

(WP 0037).

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

0015-21