AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE - Continued

DRAFT

TB 9-2320-279-13-1

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 No. 4, 5, 6, and 10 are always electrically live and can cause severe injury to

personnel. Care must be taken when working around these circuit breakers.

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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 9 of this fault.

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

evaporator blower motor assembly (WP 0034).

Verify repair, go to Step 9 of this fault.

VOLTAGE TEST

(1) Place positive (+) probe of multimeter on wire 1640

at circuit breaker No. 11.

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

good ground.

(a) If 22 to 28 vdc are not measured, go to Step 8 of

this fault.

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

switch OFF and replace circuit breaker No. 11

(WP 0017). Verify repair, go to Step 9 of this

fault.

HEMAC139