Hyundai Elantra (CN7): Heating, Ventilation and Air Conditioning / Troubleshooting

Hyundai Elantra (CN7) 2021-2026 Service Manual / Heating, Ventilation and Air Conditioning / 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
Blower fuse
Blower relay
Blower motor
Power mosfet
Blower speed control switch
Wire harness
No air temperature control
Engine coolant capacity
Heater control assembly
No compressor operation
Refrigerant capacity
A/C fuse
Compressor
A/C pressure transducer
A/C switch
Evaporator temperature sensor
Wire harness
Vented air not cold
Refrigerant capacity
Refrigerant pressure
Drive belt
Compressor
A/C pressure transducer
Evaporator temperature sensor
A/C switch
Heater control assembly
Wire harness
Insufficient cooling
Refrigerant capacity
Drive belt
Compressor
Condenser
Expansion valve
Evaporator
Refrigerant lines
A/C pressure transducer
Heater control assembly
No engine idle-up when A/C switch ON
Engine ECM
Wire harness
No air inlet control
Heater control assembly
No mode control
Heater control assembly
Mode actuator
No cooling fan operation
Cooling fan fuse
Fan motor
Engine ECM
Wire harness

    SpecificationAir Conditioner Item Specification CompressorTypeGamma 1.6 MPI, Gasoline 2.0 NU MPI, Gasoline 1.

    Other information:

    Hyundai Elantra (CN7) 2021-2026 Service Manual: Heater Unit

    Components and components location Component Location1. Heater unit assemblyCompoents1. Heater unit assembly2. Heater tube cover3. Heater core assembly4. Mode control actuator [LH]5. Dummy PTC6. Temperature control actuator [LH]7. Heater case [LH]8.

    Hyundai Elantra (CN7) 2021-2026 Service Manual: Evaporator Core

    Repair procedures Replacement1.Disconnect the negative (-) battery terminal. 2.Remove the heater and blower assembly.(Refer to Heater - "Heater Unit") 3.Remove the heater core cover (A) after loosening the mounting screws.4.Pull out the evaporator core (A) from the heater unit.

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