AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE - continued

DRAFT

TB 9-2320-364-13&P-1

AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE - 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.

Circuit breakers CB5, CB6, CB12, CB20, CB22, CB23, and relays R3, R13 - R19, R26, R28, R32, R33

are always electrically live and can cause severe injury to personnel. Care must be exercised

when working under the ECB cover.

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CONTINUITY TEST

(1) Set multimeter switch to ohms.

(2) Place positive (+) probe of multimeter on AC heater/

evaporator blower motor case.

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

good ground.

(a) If there is no continuity, repair AC heater/

evaporator blower motor ground wire (see

Appendix A) or replace AC heater/evaporator

blower motor (WP 0034). Verify repair, go to

Step 8 of this fault.

(b) If there is continuity, replace AC heater/

evaporator blower motor assembly (WP 0034).

Verify repair, go to Step 8 of this fault.

VOLTAGE TEST

(1) Place positive (+) probe of multimeter on wire

1280A at AC 20 AMP circuit breaker.

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

good ground.

(a) If 22 to 28 vdc are not measured, repair wire

1280A (see Appendix A) or replace wire 1280A

harness (WP 0047). Verify repair, go to Step 8

of this fault.

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

switch OFF and replace AC 20 AMP circuit

breaker (WP 0018). Verify repair, go to Step 8

of this fault.

PLSAC159

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