Hyundai Sonata AC Not Cooling: How to Fix

ByChalobah Leonard Hyundai

The Hyundai Sonata is a popular midsize sedan that offers a comfortable ride, plenty of features, and reliable performance. However, a common issue that owners face is the air conditioning (AC) system not cooling. If you ever experience such issues, a question may arise in your mind: Hyundai Sonata AC not cooling: how to fix?

Basically, to fix the Hyundai Sonata AC not cooling, you have to check the refrigerant levels, replace the condenser fan motor, and check the compressor. Resolving these things can make your AC run as before.

If this isn’t enough to answer your question, we will discuss the causes of this problem and provide step-by-step instructions on how to fix it below. You will find useful tips and information that will help you get your AC back to its optimal performance.

Importance Of Fixing The Hyundai Sonata AC Not Cooling In Hot Weather

Fixing the AC in hot weather is vital because it helps to provide comfort and improve indoor air quality. A functional AC system regulates temperature and humidity levels, making the indoor environment more comfortable, especially during hot and humid weather conditions.

It also reduces the risk of health issues, such as heat exhaustion and dehydration, by providing cool air. Fixing your vehicle’s AC also ensures that it runs efficiently and prevents costly repairs in the future, saving you money and maintaining a healthy indoor environment.

Causes Of The AC Not Cooling In The Hyundai Sonata

There are several causes of AC Not cooling in the Hyundai Sonata. Here we’ve discussed some of the common causes of this issue.

  • Low Refrigerant Levels: Refrigerant is responsible for cooling the air in the AC system. Low refrigerant levels may lead to poor cooling.
  • Blocked Condenser Coils: Condenser coils play a crucial role in removing heat from the refrigerant. Blocked coils can prevent the AC from cooling effectively.
  • Faulty Compressor: The compressor is the heart of the AC system, and if it fails, it will prevent the AC from cooling.
  • Electrical Problems: Electrical issues such as blown fuses, faulty relays, or damaged wires can also lead to AC problems.
  • Dirty Air Filter: A dirty air filter can restrict air flow, making it difficult for the AC to cool effectively.
  • Clogged Expansion Valve: The expansion valve regulates the flow of refrigerant; if it is clogged, it can lead to poor cooling.

Step-By-Step Guide on How to Fix Hyundai Sonata AC Not Cooling

If you’re experiencing issues with your Hyundai Sonata’s air conditioning system not cooling properly, don’t worry, it’s a common problem and can often be fixed with a few simple steps. Here’s a step-by-step guide to help you diagnose and fix the AC issue on your vehicle:

Step-1: Checking Refrigerant Level

To check the refrigerant level in a Hyundai Sonata, you will need to follow these steps:

  • Locate the low-pressure port on the air conditioning system, typically near the firewall on the passenger side of the engine compartment.
  • Attach a refrigerant gauge to the low-pressure port.
  • Start the engine and turn the air conditioner to maximum cooling.
  • Observe the gauge reading, it should be within the specified range as indicated in the vehicle manual.
  • If the refrigerant level is low, add refrigerant until it reaches the proper level.
  • For a good refrigerant level, the issue with the air conditioning system could be with the compressor, the condenser, or the evaporator. In that case, it is recommended to have it inspected by a professional.

Step-2: Clearing Blocked Condenser

Cleaning the condenser is crucial in fixing the Hyundai Sonata AC not cooling problem. Here are the steps to follow:

  1. Turn off the air conditioning system and the engine.
  2. Open the hood and locate the condenser.
  3. Remove any debris from the condenser, such as leaves and dirt, using a brush or vacuum.
  4. Spray the condenser with a non-corrosive cleaner and allow it to sit for a few minutes.
  5. Rinse off the cleaner with a garden hose, taking care not to bend or damage the condenser fins.
  6. Allow the condenser to dry completely before re-installing the cover and closing the hood.
  7. Turn on the engine and the air conditioning system to see if the AC is now cooling.

Step-3: Troubleshooting the Compressor

To diagnose a faulty compressor in a Hyundai Sonata AC system that is not cooling, follow these steps:

  1. Check The Refrigerant Level: The compressor may not be functioning correctly because of a low refrigerant level.
  2. Inspect the Compressor Clutch: If the clutch is not engaging, the compressor may be faulty.
  3. Look for Leaks: Visually inspect the compressor for any visible refrigerant leaks.
  4. Explore Pressure: Use a refrigerant pressure gauge to check the system’s high and low-side pressures.
  5. Examine the Electrical System: Check the wiring and fuses for the AC system to ensure there is proper voltage to the compressor.

Step-4: Replacing Broken AC Fan

You need to follow the below steps to replace the broken Ac fan in your Hyundai Sonata:

  1. Make sure that the AC system is receiving power. Check the fuse box and ensure that the fuse for the AC system is properly seated and not blown.
  2. Inspect the AC system’s condenser and evaporator core for any visible signs of damage or wear. Clean or replace these components if necessary.
  3. Check the AC system’s pressure lines for any signs of leakage. If they are leaking, replace the lines.
  4. Disconnect the AC system’s fan motor and replace it with a new one.
  5. Examine the AC system’s compressor and replace it if necessary.
  6. Charge the AC system with the proper amount of refrigerant.
  7. Start the engine and turn on the AC system. Check to make sure that the fan is running and that the AC system is cooling properly.

Step-5: Electrical Issues

Solving electrical issues is very important to have a working AC in your Hyundai Sonata. Here are the steps to solve electrical issues:

  • Faulty or Loose Wiring: Electrical wiring can become loose or corroded over time, which prevents the AC compressor from receiving the necessary power to function properly.
  • Low Refrigerant Levels: Refrigerant is the fluid that helps to cool the air within the AC system. When it is low, the AC will not work.
  • Faulty Compressor: The compressor is the part of the AC system that circulates the refrigerant. If it is not working correctly, the AC won’t work.
  • Blown Fuses or Relays: Your AC system needs certain fuses and relays to function correctly. When these are blown or faulty, the system will not turn on.
  • Faulty Thermostat: The thermostat is the part of the AC system that controls the temperature. If it is not working correctly, the AC won’t turn on or won’t cool the vehicle appropriately.

Final Words

The lack of cooling in your Hyundai Sonata AC system could be due to various reasons, ranging from clogged air filters, low refrigerant levels, faulty compressors, or even a damaged evaporator. If you are facing this issue, it is always recommended to get it checked by a professional mechanic.

However, if you want to try fixing it yourself, you can start by checking the air filters, adding refrigerant, and checking the compressor’s function. Remember, fixing the AC system is a technical task and requires proper handling of refrigerant and other components.

So, ensure you have the necessary knowledge and tools before attempting any repair work. We hope by following this step-by-step instruction outlined above you now know about: Hyundai Sonata AC not cooling: how to fix.