Hyundai Sonata LF Quiz
Heating, Ventilation, and Air Conditioning

Repair Procedures

In this manual: Heating, Ventilation, and Air Conditioning
General Information — 9Engine Mechanical System — 90Engine Electrical System — 58Emission Control System — 24Engine Control System/Fuel System — 114Drive Shaft and Axle — 15Suspension System — 35Steering — 19Restraints — 50Brake System — 54Body (Interior and Exterior) — 213Body Electrical System — 241Heating, Ventilation, and Air Conditioning — 56DCT (Dual Clutch Transmission) System — 52
12steps
~72min
3/5difficulty
Done 0 of 12

Refrigerant System Service Basics

Refrigerant Recovery: Use only service equipment that is UL listed and certified to meet SAE J2210 requirements for removing HFC-134a (R-134a) from air conditioning systems.
  • Air conditioning refrigerant or oil vapors may cause irritation to the eyes, nose or throat.
  • Be careful when connecting service equipment.
  • Do not inhale refrigerant or vapor.
In case of accidental system discharge, ventilate the work area before resuming work. Additional health and safety information may be obtained from refrigerant and lubricant manufacturers.
  1. Connect the R-134a Refrigerant Recovery/Recycling/Charging System (A) to the high pressure service port (C) and the low pressure service port (B), as shown, according to the equipment manufacturer's instructions.
  2. Measure the amount of refrigerant oil removed from the air conditioning system after the recovery process is complete. Be sure to add the same amount of new refrigerant oil back into the air conditioning system before charging.
System Evacuation: Use only service equipment that is UL listed and certified to meet SAE J2210 requirements for removing HFC-134a (R-134a) from air conditioning systems.
  • Air conditioning refrigerant or oil vapors may cause irritation to the eyes, nose or throat.
  • Be careful when connecting service equipment.
  • Do not inhale refrigerant or vapor.
In case of accidental system discharge, ventilate the work area before resuming work. Additional health and safety information may be obtained from refrigerant and lubricant manufacturers.
  1. When the air conditioning system has been opened to the atmosphere, for example during installation or repair, it must be evacuated using an R-134a refrigerant recovery/recycling/charging system. (If the system has been open for several days, the receiver/drier should be replaced and the system should be evacuated for several hours.)
  2. Connect the R-134a Refrigerant Recovery/Recycling/Charging System (A) to the high pressure service port (C) and the low pressure service port (B), as shown, according to the equipment manufacturer's instructions.
  3. If the low pressure does not exceed 93.3 kPa (700 mmHg, 27.6 inHg) within 10 minutes, there may be a leak in the system. Partially charge the system and check for leaks (Refer to Leak Test).
  4. Remove the low-pressure valve from the low-pressure service port.
Charging the System: Use only service equipment that is UL listed and certified to meet SAE J2210 requirements for removing HFC-134a (R-134a) from air conditioning systems.
  • Air conditioning refrigerant or oil vapors may cause irritation to the eyes, nose or throat.
  • Be careful when connecting service equipment.
  • Do not inhale refrigerant or vapor.
In case of accidental system discharge, ventilate the work area before resuming work. Additional health and safety information may be obtained from refrigerant and lubricant manufacturers.
  1. Connect the R-134a Refrigerant Recovery/Recycling/Charging System (A) to the high pressure service port (C), as shown, according to the equipment manufacturer's instructions.
  2. Add the same amount of new refrigerant oil as was removed during recovery. Use only the specified refrigerant oil. Charge the system with R-134a refrigerant. Do not overcharge the system, or the compressor will be damaged. Capacity: Theta 2.4 GDI: 575 ± 20 g (20.2 ± 0.70 oz.), Theta 2.0 T-GDI / Gamma 1.6 T-GDI: 525 ± 20 g (18.5 ± 0.70 oz.)
Refrigerant Leak Test: Always check for leaks using an electronic leak detector whenever a leak is suspected or refrigerant is lost, and during any service operation that involves disassembly, loosening or disconnecting of fittings.
To use the leak detector correctly, read the manual provided by the manufacturer.
If a refrigerant leak is detected, perform the following steps:
  1. Check the torque on the connection fittings and, if loose, tighten to the specified torque. Check for refrigerant leaks using a leak detector (A).
  2. If the leak continues even after the fitting has been tightened, discharge the refrigerant from the system, disconnect the fittings and inspect their sealing surfaces for damage. Always replace the fitting, even if the damage is minor.
  3. Check the compressor oil and add oil if necessary.
  4. Charge the system and recheck for refrigerant leaks. If no leaks are found, evacuate and recharge the system again.

Test yourself

A quick Hyundai Sonata LF quiz: every answer comes with an explanation and a link to the manual page.