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Condition
No cool air comes out
(Blower motor does
not operate)
Cool air does not
come out or insuffi-
cient cooling (A/C sys-
tem normal operation)
Cool air does not
come out only inter-
mittently
Possible Cause
Fuse blown
Blower motor resistor faulty
Blower speed selector faulty
Wiring or grounding faulty
Blower motor faulty
Insufficient or excessive charge of
refrigerant
Condenser clogged
A/C evaporator clogged or frosted
A/C evaporator temperature sensor
faulty
Expansion valve faulty
Desiccant clogged
Compressor drive belt loosened or bro-
ken
Magnetic clutch faulty
Compressor faulty
Air in A/C system
Air leaking from heater and cooling unit
or air duct
Heater and ventilation system faulty
Blower motor faulty
Excessive compressor oil existing in
A/C system
Wiring connection faulty
Expansion valve faulty
Excessive moisture in A/C system
Magnetic clutch faulty
Excessive charge of refrigerant
AIR CONDITIONING (OPTIONAL) 1B-7
Correction
Check related fuses, and check for short
circuit to ground.
Check blower motor resistor referring to
"Blower Motor Resistor Inspection" in Sec-
tion 1A.
Check blower speed selector referring to
"Blower Speed Selector Inspection" in
Section 1A.
Repair as necessary.
Check blower motor referring to "Blower
Motor Inspection" in Section 1A.
Check charge of refrigerant and system for
leaks.
Check condenser.
Check A/C evaporator and A/C evaporator
temperature sensor.
Check A/C evaporator temperature sen-
sor.
Check expansion valve.
Check receiver / dryer
Adjust or replace drive belt.
Check magnetic clutch.
Check compressor.
Replace desiccant, and perform evacua-
tion and charge.
Repair as necessary.
Check air inlet box (cooling unit), heater
control assembly and heater unit.
Check blower motor referring to "Blower
Motor Inspection" in Section 1A.
Pull out excess compressor oil in A/C sys-
tem circuit, and check compressor.
Repair as necessary.
Check expansion valve.
Replace receiver / dryer, and perform
evacuation and charge.
Check magnetic clutch.
Check charge of refrigerant.
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