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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