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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PRESSURE TEST

(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 0030).

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 center heater cover

(WP 0037).

(6)

Remove four screws and evaporator core cover

from AC heater/evaporator assembly (WP 0030).

(7)

Inspect AC expansion valve for excessive

sweating and frost.

(a) If AC expansion valve is not free from

excessive sweating and frost:

1. Recover R-134a refrigerant (WP 0050).

2. Replace AC expansion valve (WP 0030).

(b) If AC expansion valve is free from excessive

sweating and frost:

1. Recover R-134a refrigerant (WP 0050).

2. Replace AC evaporator core (WP 0030).

(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).

HEMAC187

(13) Evacuate and charge system (WP 0050).

(14) Verify repair, go to Step 22 of this fault.

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