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

11.

KNOWN INFO

TEST OPTIONS

Read WARNING on

Power to fan control switch OK.

page 0012-23.

Voltage test.

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 1158 at low

AC condenser motor solenoid OK.

To isolate system fault.

pressure switch connector,

AC condenser motor power wire OK.

when fan control switch is set

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to an on position and

AC condenser motor ground wire OK.

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.

Connect AC harness

pressure switch

Fan control switch OK.

connector, and go to

Wire 1156 OK.

Step 13 of this fault.

AC temperature control switch OK.

YES

AC heater/evaporator core not blocked or

damaged.

AC temperature control switch temperature

probe OK.

Heater cable OK.

AC cable OK.

Defrost cable OK.

AC compressor clutch OK.

POSSIBLE PROBLEMS

AC harness wire 1154 faulty.

Low pressure switch faulty.

AC harness wire 1156 faulty.

AC harness wire 1158 faulty.

High pressure switch faulty.

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0012-22