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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KNOWN INFO

TEST OPTIONS

Power to fan control switch OK.

Audible test.

Does AC compressor clutch

Blower operates.

REASON FOR QUESTION

engage when engine start

AC condenser core not blocked or damaged.

If AC compressor clutch does

switch is turned on, when fan

AC compressor belts OK.

not engage, AC

control switch is set to an on

AC heater/evaporator core not blocked or

compressor will not

position and temperature

damaged.

operate.

control switch is set to the

AC temperature control switch temperature

coldest temperature position?

probe OK.

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AC condenser motor solenoid OK.

AC condenser motor power wire OK.

AC condenser motor ground wire OK.

AC condenser motor OK.

AC condenser assembly harness black wire

OK.

Go to Step 10 of this

AC harness wire 1155 OK.

fault.

AC condenser assembly harness green wire

OK.

YES

AC condenser motor solenoid ground wire

OK.

Fan control switch OK.

Wire 1156 OK.

AC temperature control switch OK.

POSSIBLE PROBLEMS

Heater cable faulty.

AC cable faulty.

Defrost cable faulty.

AC compressor clutch faulty.

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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0012-12