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.

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VOLTAGE TEST

(1) Remove eight screws and top heater cover

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

(3) Place positive (+) probe of multimeter on wire 1082

at fan control switch.

(4) 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 wire 1082

(see Appendix A) or notify Supervisor. Verify

repair, go to Step 9 of this fault.

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

switch OFF and go to Step 3 of this fault.

CONTINUITY TEST

(1) Disconnect wire 1082 from fan control switch

(2) Turn fan control switch to high speed (fully

clockwise) position (WP 0004).

(3) Set multimeter switch to ohms.

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

switch at terminal wire 1082.

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

switch at terminal orange wire.

(a) If there is no continuity, replace fan control

switch (WP 0031). Verify repair, go to Step 9 of

this fault.

(b) If there is continuity, connect wire 1082 on fan

control switch and go to Step 4 of this fault.

HEMAC137