AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE

DRAFT

TB 9-2320-279-13-1

0010

AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE

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INITIAL SETUP:

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Materials/Parts

Maintenance Level

None

Field Level Maintenance

Personnel Required

Equipment Condition

MOS 52C, Utilities equipment repairer

Shut off engine (TM 9-2320-279-10).

Parking brake applied (TM 9-2320-279-10).

References

Wheels chocked (TM 9-2320-279-10).

TM 9-2320-279-10

Tools and Special Tools

TM 9-2320-279-20

Tool Kit, General Mechanic's (Item 7, Appendix F)

Multimeter (Item 2, Appendix F)

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START

WARNING

KNOWN INFO

TEST OPTIONS

Read WARNING on

None

Voltage test.

page 0010-3.

Multimeter.

POSSIBLE PROBLEMS

Are 22 to 28 vdc measured on

REASON FOR QUESTION

Circuit breaker No. 11 faulty.

circuit breaker No. 11,

Engine start switch faulty.

If 22 to 28 vdc are not

terminal wire 1082, when

measured, AC heater/

Wire 1640 faulty.

engine start switch is in the

evaporator blower will not

Wire 1082 faulty.

ON position?

operate.

Fan control switch faulty.

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Fan control switch harness connector loose

or faulty.

AC heater/evaporator blower motor resistor

harness connector loose or faulty.

Go to Step 7 of this

AC heater/evaporator blower motor power

fault.

wire faulty.

AC heater/evaporator blower motor faulty.

YES

AC heater/evaporator blower motor ground

wire faulty.

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(0010-1 blank)/0010-2