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A/C System Symptom Diagnosis

A/C SYSTEM DIAGNOSTIC 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 CHARGING A/C WITH REFRIGERANT .
Fuse blown Check related fuses, and then check for short circuit to ground  .
Evaporator temperature sensor faulty Check evaporator temperature sensor referring to A/C EVAPORATOR TEMPERATURE SENSOR INSPECTION .
A/C refrigerant pressure sensor faulty Check A/C refrigerant pressure sensor referring to A/C REFRIGERANT PRESSURE SENSOR AND ITS CIRCUIT INSPECTION .
Wiring or grounding faulty Repair as necessary  .
ECT sensor faulty Check ECT sensor referring to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .
ECM faulty Check ECM referring to A/C SYSTEM INSPECTION AT ECM .
HVAC control module faulty Check HVAC control module referring to HVAC CONTROL MODULE AND ITS CIRCUITS INSPECTION .
Magnet clutch faulty Check magnet clutch referring to, MAGNET CLUTCH OPERATING CHECK .
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 COMPRESSOR RELAY INSPECTION .
Temperature selector, blower speed selector, and/or air flow selector faulty Check HVAC control module referring to HVAC CONTROL MODULE AND ITS CIRCUITS INSPECTION .
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  .
Radiator cooling fan motor relay faulty Check radiator cooling fan motor relay referring to RADIATOR COOLING FAN RELAY INSPECTION .
Radiator cooling fan motor faulty Check radiator cooling fan motor referring to RADIATOR COOLING FAN MOTOR ON-VEHICLE INSPECTION .
ECM faulty Check ECM referring to A/C SYSTEM INSPECTION AT ECM .
HVAC control module faulty Check HVAC control module referring to HVAC CONTROL MODULE AND ITS CIRCUITS INSPECTION .
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 .
Blower speed selector faulty Check blower speed selector referring to HVAC CONTROL MODULE AND ITS CIRCUITS INSPECTION .
HVAC control module faulty Check HVAC control module referring to HVAC CONTROL MODULE AND ITS CIRCUITS INSPECTION .
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 RELAY INSPECTION .
Cool air does not come out or insufficient cooling (A/C system normal operation)  Insufficient or excessive charge of refrigerant Check the amount of refrigerant and system for leaks  .
Condenser clogged Check condenser referring to A/C CONDENSER ASSEMBLY ON-VEHICLE INSPECTION .
A/C evaporator clogged or frosted Check A/C evaporator and evaporator temperature sensor referring to A/C EVAPORATOR INSPECTION  and A/C EVAPORATOR TEMPERATURE SENSOR INSPECTION .
Evaporator temperature sensor faulty Check evaporator temperature sensor referring to A/C EVAPORATOR TEMPERATURE SENSOR INSPECTION .
Expansion valve faulty Check expansion valve referring to EXPANSION VALVE ON-VEHICLE INSPECTION .
Desiccant clogged Check desiccant  .
Compressor drive belt loosened or broken Adjust or replace drive belt  .
Magnet clutch faulty Check magnet clutch referring to MAGNET CLUTCH OPERATING CHECK .
Compressor faulty Check compressor  .
Air in A/C system Replace desiccant, and then perform evacuation and charge referring to OPERATION PROCEDURE FOR CHARGING A/C WITH REFRIGERANT .
Air leaking from HVAC unit or air duct Repair as necessary  .
Heater and ventilation system faulty Check HVAC unit  .
Temperature selector faulty Check temperature selector referring to HVAC CONTROL MODULE AND ITS CIRCUITS INSPECTION .
HVAC control module faulty Check HVAC control module referring to HVAC CONTROL MODULE AND ITS CIRCUITS INSPECTION .
Temperature control actuator faulty Check temperature control actuator referring to TEMPERATURE CONTROL ACTUATOR INSPECTION .
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 ON-VEHICLE INSPECTION .
Excessive moisture in A/C system Replace desiccant, and then perform evacuation and charge referring to OPERATION PROCEDURE FOR CHARGING A/C WITH REFRIGERANT .
Magnet clutch faulty Check magnet clutch referring to MAGNET CLUTCH OPERATING CHECK .
Excessive amount of refrigerant Check the amount of refrigerant  .
Cool air comes out only at high speed  Condenser clogged Check condenser referring to A/C CONDENSER ASSEMBLY ON-VEHICLE INSPECTION .
Insufficient charge of refrigerant Check the amount of refrigerant and system for leaks  .
Air in A/C system Replace desiccant, and then perform evacuation and charge referring to OPERATION PROCEDURE FOR CHARGING A/C WITH REFRIGERANT .
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 A/C EVAPORATOR INSPECTION  and A/C EVAPORATOR TEMPERATURE SENSOR INSPECTION .
Insufficient air flow of cooled air  A/C evaporator clogged or frosted Check A/C evaporator and evaporator temperature sensor referring to A/C EVAPORATOR INSPECTION  and A/C EVAPORATOR TEMPERATURE SENSOR INSPECTION .
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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