AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS (LOW, MEDIUM, AND HIGH) (Cont)

DRAFT

TB 9-2320-279-13-1

AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS

(LOW, MEDIUM, AND HIGH) - 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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CONTINUITY TEST

(1) Disconnect fan control switch harness red wire from

fan control switch (WP 0031).

(2) Set multimeter switch to ohms.

(3) Place positive (+) probe of multimeter on fan control

switch harness red wire AC heater/evaporator

blower motor resistor harness connector, terminal 1.

(4) Place negative (-) probe of multimeter on fan control

switch harness red wire at fan control switch.

(a) If there is no continuity, repair fan control switch

harness red wire (see Appendix A) or replace

fan control switch harness (WP 0031). Verify

repair, go to Step 15 of this fault.

(b) If there is continuity, replace fan control switch

(WP 0031). Verify repair, go to Step 15 of this

fault.

VOLTAGE TEST

(1) Disconnect fan control switch harness connector

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

(3) Turn fan control switch to medium speed position

(4) Place positive (+) probe of multimeter on brown wire

at fan control switch harness connector, terminal 2.

(5) 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 go to Step 11 of this fault.

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

switch OFF and go to Step 10 of this fault.

HEMAC132