Updated on Reading Time: 3 minutes
If your Hyundai A/C has been blowing hot air, not cold, there is a chance the system is low on refrigerant.
Repair Time:
The typical time range in hours required to complete this repair.
Repair Cost:
The average repair cost range in USD to complete this repair by either an honest mechanic or as a DIY. Including the cost of parts but not tools.
Repair Difficulty:
This indicates how difficult it is for most DIYers and mechanics to perform this repair.
Refrigerant leaks can cause the system pressure to drop and the A/C compressor to shut down. The procedure will only work if your system has a small refrigerant leak.
How to Recharge A/C Refrigerant on a Hyundai
What you will need
- R134a Refrigerant Recharge Kit
- Work Gloves
- Safety Glasses
Procedure
- Park the Hyundai. Set the parking brakes, place the gear selector in Park, and allow the engine to idle.
- Turn the air conditioner ON. Set the climate control to the lowest temperature and the blower to the max.
- Open the hood of your Hyundai. Locate the low-pressure air conditioner service port and remove the cap.
- Locate the air conditioner charging port or service port. The A/C port is behind the engine near the firewall in the Elantra.
- If the connector from the A/C recharge kit doesn’t fit on the port, you may be trying to connect to the high-pressure port, which is a different size than the low-pressure port. If you still have trouble locating the A/C charging port on your Hyundai, this video explains it all.
- Next, connect the A/C charging kit.
Add refrigerant to your air conditioner system. Once you connect the gauge, take a look at it to read your air conditioner system’s pressure. If the pressure is low, the gauge reading will be in the white zone. If the pressure is normal, the gauge should be in the green or blue area, depending on the A/C kit you are using. You should not read on the HIGH / RED zone except when the car is turned off.
- Keep the can UPRIGHT. As you charge the system, shake the can every two or three seconds while charging. Every few seconds, release the trigger to stop the charging process. Take a look at the pressure gauge. (It is normal for the gauge to show overcharging when the engine is turned off.) Don’t overcharge the A/C system. Stop recharging the A/C system once the pressure is within the acceptable range. Measurement should only be taken while the engine is running.
Disconnect the A/C recharge kit. Detach the quick connection from the A/C port. Reinstall the cap. Don’t overtighten the cap. Close the hood and enjoy your AC system.
Remember that a system with a large leak may lose the refrigerant quickly and require mechanic repair before being topped off with refrigerant.
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This procedure is not recommended for A/C systems that are empty. On an empty A/C system, the air must be extracted with a vacuum pump. Topping off the Hyundai A/C system is very easy and can take up to twenty minutes, depending on the system’s capacity.
We hope you find the Hyundai Air Conditioner A/C Recharge Instructions guide helpful. Check these troubleshooting and repair guides for more help on your Hyundai.
Frequently Asked Questions
What type of refrigerant do Hyundai vehicles use?
R134a – Always check the sticker under the hood or the owner’s manual.
Is A/C covered under the Hyundai warranty?
Yes, as long as the vehicle is under the manufacturer’s warranty.
How do I know if my AC needs to be recharged?
The aircon blows hot air.
Malfunctioning A/C clutch
An unpleasant smell is coming off from the vents.
Leaking Refrigerant
Written and fact-checked by:
YOUCANIC Techs YOUCANIC articles are written by authors who collectively have over 60 years of experience in the automotive field and years of hands-on experience on vehicles. These authors are certified ASE G1 Automotive Maintenance engine professionals (the highest level certification for vehicle maintenance and repair). They hold associate’s and bachelor’s degrees, as well as having gone on to further study to receive a master’s and doctorate degrees. These authors collaborate on research, writing, editing, and fact-checking every article to ensure that it is accurate and up to date and delivers the best counsel and information to YOUCANIC readers. View all postsRush*t Hila is an engineer and ASE certified in G1 Automotive Maintenance 
