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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21.

WARNING

KNOWN INFO

TEST OPTIONS

Read WARNING on

Power to fan control switch OK.

page 0012-43.

Voltage test.

Blower operates.

Multimeter.

AC condenser core not blocked or damaged.

REASON FOR QUESTION

Are 22 to 28 vdc measured on

AC compressor belts OK.

AC harness wire 1156 at AC

AC heater/evaporator core not blocked or

To isolate system fault.

damaged.

condenser assembly

connector, when fan control

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AC temperature control switch temperature

probe OK.

switch is set to an on position

Heater cable OK.

and temperature control

switch is set to the coldest

AC cable OK.

temperature position?

Defrost cable OK.

AC compressor clutch OK.

AC harness wire 1154 OK.

Low pressure switch OK.

AC harness wire 1158 OK.

High pressure switch OK.

Go to Step 24 of this

AC condenser motor power wire OK.

fault.

AC condenser motor ground wire OK.

AC condenser motor OK.

YES

AC condenser assembly harness black wire

OK.

AC harness wire 1155 OK.

POSSIBLE PROBLEMS

AC condenser assembly harness green wire

faulty.

AC condenser motor solenoid faulty.

AC condenser motor solenoid ground wire

faulty.

Fan control switch faulty.

Wire 1156 faulty.

AC harness wire 1156 faulty.

AC temperature control switch faulty.

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0012-42