Hyundai Sonata: General Information / Troubleshooting

Troubleshooting
Problem Symptoms Table
Before replacing or repairing air conditioning components, first determine if the malfunction is due to the refrigerant charge, air flow or compressor.
Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely cause of the problem. Check each part in order. If necessary, replace these parts.
After correcting the malfunction, check the complete system to ensure that performance is satisfactory.
Standard:
Symptom
Suspected Area
No blower operation
1. Blower fuse
2. Blower relay
3. Blower motor
4. Power mosfet
5. Heater control assembly
6. Blower speed control switch
7. Wire harness
No air temperature control
1. Engine coolant capacity
2. Temperature dial switch
3. Heater control assembly
No compressor operation
1. Refrigerant capacity
2. A/C fuse
3. Compressor
4. A/C pressure transducer
5. A/C switch
6. Heater control assembly
7. Evaporator temperature sensor
8. Wire harness
Vented air not cold
1. Refrigerant capacity
2. Refrigerant pressure
3. Drive belt
4. Compressor
5. A/C pressure transducer
6. Evaporator temperature sensor
7. A/C switch
8. Heater control assembly
9. Wire harness
Insufficient cooling
1. Refrigerant capacity
2. Drive belt
3. Compressor
4. Condenser
5. Expansion valve
6. Evaporator
7. Refrigerant lines
8. A/C pressure transducer
9. Heater control assembly
No engine idle-up when A/C switch ON
1. Engine ECM
2. Heater control assembly
3. Wire harness
No air inlet control
1. Recirculate and fresh switch
2. Heater control assembly
No mode control
1. Heater control assembly
2. Temperature dial switch
3. Mode actuator
No cooling fan operation
1. Cooling fan fuse
2. Fan motor
3. Engine ECM
4. Wire harness

Specifications
Specification Air Conditioner ltem Specification Theta 2.4 GDI Theta 2.0 T-GDI / Gamma 1.6 T-GDI CompressorType6SES14 Oil type & CapacityND8 (PAG) OIL 80 ± 10 cc (2.82 ± 0.35 oz.) Pulley ...

Air Conditioning System
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Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Knee Airbag (KAB) Module Repair procedures
Removal 1. Disconnect the battery negative cable and wait for at least three minutes before beginning work. 2. Remove the crash pad lower panel. (Refer to Body - "Crash Pad Lower Panel") 3. Remove the mounting nuts (A). 4. Disconnect the knee airbag connector (B). Installation ...

Hyundai Sonata LF 2014-2019 Service Manual: Components and Components Location
Components (1) Components (2) Components (3) ...

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