AC HEATER/EVAPORATOR BLOWER OPERATES BUT NO COLD AIR FROM DUCTS DURING AC OPERATIONS (Cont)

DRAFT

TB 9-2320-279-13-1

AC HEATER/EVAPORATOR BLOWER OPERATES BUT NO COLD AIR FROM

DUCTS DURING AC OPERATIONS - 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.

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VOLTAGE TEST

(1) Disconnect AC harness wire 1156 from high

pressure switch connector (WP 0039).

(2) Turn fan control switch to an on position (low,

medium, or high) (WP 0004).

(3) Turn AC temperature control switch to the coldest

position (fully clockwise) (WP 0004).

(4) Turn engine start switch ON (TM 9-2320-279-10).

(5) Place positive (+) probe of multimeter on AC

harness wire 1156 at high pressure switch

connector.

(6) Place negative (-) probe of multimeter on a known

good ground.

(a) If 22 to 28 vdc are not measured, turn engine

start switch OFF and repair AC harness wire

1156 (see Appendix A) or replace AC wiring

harness (WP 0046). Verify repair, go to Step 27

of this fault.

(b) If 22 to 28 vdc are measured, turn engine switch

OFF, and go to Step 14 of this fault.

HEMAC156