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A/C System Symptom Diagnosis

SYMPTOM DIAGNOSIS DESCRIPTION CHART

Condition Possible Cause Action
No cool air comes out (A/C system does not operate  ) No refrigerant Perform recovery, evacuation and charge referring to OPERATION PROCEDURE FOR REFRIGERANT CHARGE : Manual A/C.
Fuse blown Check related fuses, and then check for short circuit to ground  .
A/C switch faulty Check A/C switch referring to INSPECTION OF HVAC CONTROL MODULE AND ITS CIRCUIT: AUTO A/C .
Evaporator temperature sensor faulty Check evaporator temperature sensor referring to EVAPORATOR TEMPERATURE SENSOR INSPECTION : Manual A/C.
A/C refrigerant pressure sensor faulty Check A/C refrigerant pressure sensor referring to A/C REFRIGERANT PRESSURE SENSOR AND ITS CIRCUIT INSPECTION : Manual A/C.
Wiring or grounding faulty Repair as necessary  .
ECM faulty Check ECM referring to A/C SYSTEM INSPECTION AT ECM: AUTO A/C .
HVAC control module faulty Check HVAC control module referring to INSPECTION OF HVAC CONTROL MODULE AND ITS CIRCUIT: AUTO A/C .
Magnet clutch faulty Check magnet clutch referring to MAGNET CLUTCH INSPECTION : Manual A/C.
Compressor drive belt loosened or broken Adjust or replace drive belt  .
Compressor faulty Check compressor  .
Compressor relay faulty Check compressor relay referring to A/C SYSTEM RELAY INSPECTION : Manual A/C.
BCM faulty Check BCM referring to INSPECTION OF BCM AND ITS CIRCUITS .
No cool air comes out (radiator cooling fan motor does not operate  ) Fuse blown Check related fuses, and then check for short circuit to ground  .
Wiring or grounding faulty Repair as necessary  .
Condenser cooling fan motor relay faulty Check condenser cooling fan motor relay referring to A/C SYSTEM RELAY INSPECTION : Manual A/C.
Condenser cooling fan motor faulty Check condenser cooling fan motor referring to CONDENSER COOLING FAN INSPECTION : Manual A/C.
ECM faulty Check ECM referring to A/C SYSTEM INSPECTION AT ECM: AUTO A/C .
HVAC control module faulty Check HVAC control module referring to INSPECTION OF HVAC CONTROL MODULE AND ITS CIRCUIT: AUTO A/C .
No cool air comes out (blower motor does not operate  ) Fuse blown Check related fuses, and then check for short circuit to ground  .
Blower motor controller faulty Check blower motor controller referring to BLOWER MOTOR CONTROLLER INSPECTION: AUTO A/C .
HVAC control module faulty Check HVAC control module referring to INSPECTION OF HVAC CONTROL MODULE AND ITS CIRCUIT: AUTO A/C .
Wiring or grounding faulty Repair as necessary  .
Blower motor faulty Check blower motor referring to BLOWER MOTOR INSPECTION .
Blower motor relay faulty Check blower motor relay referring to BLOWER MOTOR INSPECTION .
Cool air does not come out or insufficient cooling (A/C compressor normal operation  ) Insufficient or excessive charge of refrigerant Check the amount of refrigerant and system for leaks  .
Condenser clogged Check condenser referring to CONDENSER ASSEMBLY ON-VEHICLE INSPECTION : Manual A/C.
A/C evaporator clogged or frosted Check A/C evaporator and evaporator temperature sensor referring to EVAPORATOR INSPECTION : Manual A/C and EVAPORATOR TEMPERATURE SENSOR INSPECTION : Manual A/C.
Evaporator temperature sensor faulty Check evaporator temperature sensor referring to EVAPORATOR TEMPERATURE SENSOR INSPECTION : Manual A/C.
Expansion valve faulty Check expansion valve referring to EXPANSION VALVE INSPECTION : Manual A/C.
Desiccant clogged Check desiccant and cap with filter  .
Compressor drive belt loosened or broken Adjust or replace drive belt  .
Magnet clutch faulty Check magnet clutch referring to MAGNET CLUTCH INSPECTION : Manual A/C.
Compressor faulty Check compressor  .
Air in A/C system Replace condenser, and then perform evacuation and charge referring to OPERATION PROCEDURE FOR REFRIGERANT CHARGE : Manual A/C.
Air leaking from HVAC unit or air duct Repair as necessary  .
Heater and ventilation system faulty Check HVAC unit  .
HVAC control module faulty Check HVAC control module referring to INSPECTION OF HVAC CONTROL MODULE AND ITS CIRCUIT: AUTO A/C .
Temperature control actuator faulty Check temperature control actuator referring to TEMPERATURE CONTROL ACTUATOR AND ITS CIRCUIT INSPECTION: AUTO A/C .
Blower motor faulty Check blower motor referring to BLOWER MOTOR INSPECTION .
Excessive compressor oil in A/C system Drain excessive compressor oil from A/C system circuit and compressor  .
Cool air does not come out only intermittently  Wiring connection faulty Repair as necessary  .
Expansion valve faulty Check expansion valve referring to EXPANSION VALVE INSPECTION : Manual A/C.
Excessive moisture in A/C system Replace condenser, and then perform evacuation and charge referring to OPERATION PROCEDURE FOR REFRIGERANT CHARGE : Manual A/C.
Magnet clutch faulty Check magnet clutch referring to MAGNET CLUTCH INSPECTION : Manual A/C.
Excessive amount of refrigerant Check the amount of refrigerant  .
Cool air comes out only at high speed  Condenser clogged Check condenser referring to CONDENSER ASSEMBLY ON-VEHICLE INSPECTION : Manual A/C.
Insufficient charge of refrigerant Check the amount of refrigerant and system for leaks  .
Air in A/C system Replace condenser, and then perform evacuation and charge referring to OPERATION PROCEDURE FOR REFRIGERANT CHARGE : Manual A/C.
Compressor drive belt loosened or broken Adjust or replace drive belt  .
Compressor faulty Check compressor  .
Cool air does not come out only at high speed  Excessive amount of refrigerant Check the amount of refrigerant  .
A/C evaporator frosted Check A/C evaporator and evaporator temperature sensor referring to EVAPORATOR INSPECTION : Manual A/C and EVAPORATOR TEMPERATURE SENSOR INSPECTION : Manual A/C.
Insufficient air flow of cooled air  A/C evaporator clogged or frosted Check A/C evaporator and evaporator temperature sensor referring to EVAPORATOR INSPECTION : Manual A/C and EVAPORATOR TEMPERATURE SENSOR INSPECTION : Manual A/C.
Air leaking from HVAC unit or air duct Repair as necessary  .
Blower motor faulty Check blower motor referring to BLOWER MOTOR INSPECTION .
Wiring or grounding faulty Repair as necessary  .
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