Hyundai Tucson: Air Conditioning System - Instructions (R- 1234yf)

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Heating, Ventilation and Air Conditioning (HVAC) / Air Conditioning System / Air Conditioning System - Instructions (R- 1234yf)


  • The R-1234yf liquid refrigerant is a flammable gas. The gas reduces oxygen available for breathing and causes asphyxiation in high concentrations. The victim will not realize that he/she is suffocating.
  • Inhalation may cause central nervous system effects and may cause drowsiness and dizziness.
  • Ingestion may cause gastrointestinal discomfort. It may cause skin irritation, eye irritation and respiratory tract irritation. Do not breathe vapour. Avoid contact with skin, eyes and clothing.


In case of emergency, the following precautions must be observed; First aider needs to protect himself. Take off all contaminated clothing immediately.

  • Inhalation : Move to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Use oxygen as required, provided a qualified operator is present. Call a physician.
  • Skin contact: After contact with skin, wash immediately with plenty of water. Rapid evaporation of the liquid may cause frostbite. If there is evidence of frostbite, bathe (do not rub) with lukewarm (not hot) water. If water is not available, cover with a clean, soft cloth or similar covering. Call a physician. Wash contaminated clothing before re-use.
  • Eye contact: Rinse immediately with plenty of water, also under the eyelids, for at least 15 minutes. In case of frostbite water should be lukewarm, not hot. Call a physician.
  • Ingestion : Unlikely route of exposure. As this product is a gas, refer to the inhalation section.

    Do not induce vomiting without medical advice. If conscious, drink plenty of water. Never give anything by mouth to an unconscious person. Call a physician immediately.


When handling refrigerant, the following precautions must be observed :

  • Handle with care.
  • Wear personal protective equipment.
  • Do not breathe vapour.
  • Avoid contact with skin, eyes and clothing.
  • Ensure that eyewash stations and safety showers are close to the workstation location.
  • Use only in well-ventilated areas.
  • Protect from sunlight and do not expose to temperatures exceeding 52ºC (125ºF).
  • Follow all standard safety precautions for handling and use of compressed gas cylinders.
  • Use authorized cylinders only.
  • Protect cylinders from physical damage.
  • Do not puncture or drop cylinders, expose them to open flame or excessive heat.
  • Do not remove screw cap until immediately ready for use.
  • Always replace cap after use.
  • Container is hazardous when empty.
  • Prevent the creation of flammable or explosive concentrations of vapour in air and avoid vapour concentration higher than the occupational exposure limits.
  • Keep product and empty container away from heat and sources of ignition.
  • Do not pressurize, cut, weld, braze, solder, drill, grind or expose containers to heat or sources of ignition.
  • Take measures to prevent the build up of electrostatic charge.
  • Electrical equipment should be protected to the appropriate standard.
  • Use explosion-proof equipment.
  • No sparking tools should be used.
  • No smoking.


When storing the refrigerant, the following precautions must be observed :

  • Pressurized container. Protect from sunlight and do not expose to temperatures exceeding 52ºC (125ºF). Do not pierce or burn, even after use.
  • Keep containers tightly closed in a dry, cool and well-ventilated place.
  • Keep away from heat and sources of ignition.
  • Storage rooms must be properly ventilated.
  • Ensure adequate ventilation, especially in confined areas.
  • Protect cylinders from physical damage.
  • Store away from incompatible substances.
  • Store in original container.


  • Un-controlled release of R-1234yf refrigerant in the work area may result in high concentrations of R-1234yf that can be flammable. Servicing of R-1234yf systems shall only be done in well ventilated work areas.
  • When servicing, maintaining or repairing A/C systems using flammable refrigerants (mildly flammable or higher) the work place shall meet all applicable national, regional or local regulations for work place safety as related to high pressure or flammable gases.


  • Avoid breathing any refrigerant vapor and lubricant mist. To remove refrigerant from a A/C system, use service equipment designed for recovery and removal that is certified to meet the requirements of the appropriate SAE Standards.
  • Do not increase pressure, in any R-134a, or R-1234yf mobile A/C system with shop air or another refrigerant such as HCFC-22 (R-22) for leak checking, due to potential chemical reactions, flammability of air/R-134a at elevated pressure, contamination of the system, and possible structural damage to the system.
  • To prevent an accumulation of refrigerant in case of a major refrigerant leak, open vehicle windows and doors when charging an A/C system
  • To prevent accidental release of refrigerant and minimize safety concerns, the installation of any refrigerant service equipment to the vehicle shall only be done with the engine off and after the refrigerant high side pressure has been reduced (approximately 2 to 3 min).


  • The proper handling procedures should be followed for all refrigerants as designated by the refrigerant manufacturer's Material Safety Data Sheet (MSDS).
  • Service personnel shall be aware of the high pressure relief valve location when servicing the vehicle. Seivice personnel shall not be under the vehicle when charging the refrigerant system due to potential sudden release of the high pressure relief valve.

When Handling Refrigerant


Some of the practices, techniques and procedures, as well as the information, tools and equipment which have been commonly used in mobile air conditioning system diagnosis and service of R-12 and R-134a are different for A/C systems using R-1234yf.

Modifications and adjustments have to be made based on the individual characteristics of each refrigerant. No technician may perform service or repair on a mobile air conditioning system using R-1234yf without being trained for the refrigerant being handled. Under the SAE Standard J2845 the refrigerant system should only be serviced by trained and certified technicians to insure proper and safe operation.

 Sendee technicians should always wear proper personal protective equipment while handling/ servicing systems that contain any refrigerant.

Service technicians shall read and follow the appropriate Material Safety Data Sheets (MSDS), which provide information on safety and the proper personal protective equipment to use.

  • All contact with liquid or gaseous refrigerant shall be avoided.
  • Goggles with side protection and gloves (insulated against heat loss and impermeable to refrigerant) shall be worn while working with the refrigerant circuit.
  • Exposure of the skin to refrigerant may result in frostbite, in which case rub affected area with lukewarm water. A physician shall be consulted immediately regarding the affected skin areas.
  • A physician shall be consulted immediately in the event of complaints following exposure to high refrigerant concentrations. Complaint symptoms may include: increased breathing rate, breathlessness, headache, accelerated pulse, dizziness.
  • Avoid breathing A/C refrigerant and lubricant vapor or mist. To remove refrigerant from the A/ C system, use service equipment designed for recovery of that refrigerant which is certified to meet the requirements of the appropriate SAE Standards.
  1. R-1234yf liquid refrigerant is highly volatile. A drop on the skin of your hand could result in localized frostbite. When handling the refrigerant, be sure to wear gloves.
  2. It is standard practice to wear goggles or glasses to protect your eyes, and gloves to protect your hands. If the refrigerant splashes into your eyes, wash them with clean water immediately.
  3. The R-1234yf container is highly pressurized. Never leave it in a hot place, and check storage temperature is below 52ºC (125ºF).
  4. An electronic leak detector should be used to check the system for refrigerant leakage. Bear in mind that the R-1234yf, upon coming into contact with flame, produces phosgene, a highly toxic gas.
  5. Use only recommended lubricant for R-1234yf systems. If lubricants other than the recommended one used, system failure may occur.
  6. PAG lubricant absorbs moisture from the atmosphere at a rapid rate, therefore the following precautions must be observed :
  • When removing refrigerant components from a vehicle, cap the components immediately to prevent entry of moisture.
  • When installing refrigerant components to a vehicle, do not remove the cap until just before connecting the components.
  • Complete the connection of all refrigerant tubes and hoses without delay to prevent the A/C system from taking on moisture.
  • Use the recommended lubricant from a sealed container only.
  1. If an accidental discharge in the system occurs, ventilate the work area before resume of service.
  2. Clean all dirt, grease and debris from and around connection joints before servicing and disassembly of refrigerant connections.


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