LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2012 >> SX4 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 75 (Air Conditioning System - Auto A/C) >> Diagnostic Information and Procedures >> A/C System Symptom Diagnosis
April 5, 2026: LEMON Manuals is launched! Read the announcement.

A/C System Symptom Diagnosis

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
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  .
scientia non olet · About LEMON Manuals