AC HEATER/EVAPORATOR BLOWER OPERATES BUT NO COLD AIR FROM DUCTS DURING AC OPERATIONS (Cont)

DRAFT

TB 9-2320-279-13-1

AC HEATER/EVAPORATOR BLOWER OPERATES BUT NO COLD AIR FROM

DUCTS DURING AC OPERATIONS - Continued

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WARNING

13.

KNOWN INFO

TEST OPTIONS

Read WARNING on

Power to fan control switch OK.

Voltage test.

page 0012-27.

Blower operates.

Multimeter.

AC condenser core not blocked or damaged.

Are 22 to 28 vdc measured on

REASON FOR QUESTION

AC compressor belts OK.

AC harness wire 1156 at high

If 22 to 28 vdc are not

AC condenser motor solenoid OK.

pressure switch connector,

measured, AC harness

AC condenser motor power wire OK.

when fan control switch is set

wire 1156 is faulty.

to an on position and

AC condenser motor ground wire OK.

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temperature control switch is

AC condenser motor OK.

set to the coldest temperature

AC condenser assembly harness black wire

position?

OK.

AC harness wire 1155 OK.

AC condenser assembly harness green wire

OK.

AC condenser motor solenoid ground wire

OK.

Repair AC harness

wire 1156 (see

Fan control switch OK.

Appendix A) or

Wire 1156 OK.

replace AC wiring

AC temperature control switch OK.

harness (WP 0046).

Verify repair, go to

AC heater/evaporator core not blocked or

Step 27 of this fault.

damaged.

YES

AC temperature control switch temperature

probe OK.

Heater cable OK.

AC cable OK.

Defrost cable OK.

AC compressor clutch OK.

AC harness wire 1154 OK.

Low pressure switch OK.

POSSIBLE PROBLEMS

AC harness wire 1156 faulty.

AC harness wire 1158 faulty.

High pressure switch faulty.

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0012-26