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 orange wire

from fan control switch (WP 0031).

(2) Set multimeter switch to ohms.

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

switch harness orange wire AC heater/evaporator

blower motor resistor harness connector, terminal 3.

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

switch harness orange wire at fan control switch.

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

harness orange 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.

VERIFY REPAIR

(1) If disconnected, connect fan control switch harness

connector (WP 0031).

(2) If disconnected, connect AC heater/evaporator

blower motor resistor harness connector (WP 0036).

(3) If disconnected, connect red, brown, and orange

wires on fan control switch (WP 0031).

(4) Install cover and four screws, washers, and

lockwashers on AC heater/evaporator assembly

(WP 0034).

(5) Install top heater compartment cover and eight

screws (WP 0037).

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

(7) Turn fan control switch to low, medium, and high

speed positions (WP 0004). Verify AC heater/

evaporator blower operation in all positions.

(a) If AC heater/evaporator blower does not operate

in all positions, fault is not corrected. Turn fan

control switch and engine start switch to OFF

and notify Supervisor.

(b) If AC heater/evaporator blower operates at all

positions, fault has been corrected.

HEMAC135

END OF WORK PACKAGE

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