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 compressor 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 A/C SWITCH, AIR FLOW SELECTOR (DEFROSTER SWITCH) AND AIR INTAKE SELECTOR INSPECTION: MANUAL A/C .
	Blower speed selector faulty	Check blower speed selector referring to BLOWER SPEED SELECTOR INSPECTION .
	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: MANUAL 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 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: MANUAL A/C .
	Fuse blown	Check related fuses, and then check for short circuit to ground .
No cool air comes out (blower motor does not operate)	Blower motor relay faulty	Check blower motor relay referring to BLOWER MOTOR RELAY INSPECTION .
	Blower motor resistor faulty	Check blower motor resistor referring to BLOWER MOTOR RESISTOR INSPECTION .
	Blower speed selector faulty	Check blower speed selector referring to BLOWER SPEED SELECTOR INSPECTION .
	Wiring or grounding faulty	Repair as necessary .
	Blower motor faulty	Check blower motor 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 .
	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 .
	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 .
	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 .
Cool air does not come out only at high speed	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 .