Why Is Your Car Air Conditioner Blowing Warm Air?

Why Is Your Car Air Conditioner Blowing Warm Air?

Why Is Your Car Air Conditioner Blowing Warm Air?

When the sweltering heat of summer hits, there’s nothing quite as disappointing as turning on your car’s air conditioner only to be met with a blast of warm air. It’s a frustrating experience that can make even the shortest drive feel unbearable. But why does it happen? 

If your car air conditioner is blowing warm air, you should immediately get it checked by professionals to ensure a comfortable journey during summer. Visit Royal Top Gear for car AC repair service in Dubai and get your car AC fixed promptly. Our seasoned professionals will thoroughly inspect your car to find the underlying issue and repair and replace any faulty parts so that you can get back on the road in no time and enjoy a cozy drive.

Understanding the potential causes behind your car’s air conditioner blowing warm air can help you diagnose and fix the issue, ensuring that you stay cool and comfortable on the road.

Faulty Refrigerant Levels

One of the most common reasons for warm air coming from your car’s air conditioner is low refrigerant levels. The substance that is responsible for cooling your vehicle’s cabin is called Refrigerant. Over time, refrigerant can leak from the system, leading to decreased levels and diminished cooling capacity. Additionally, refrigerant levels may decrease due to normal wear and tear or a malfunctioning component within the air conditioning system. When refrigerant levels are low, the air conditioner will struggle to produce cold air, resulting in warm or lukewarm air blowing from the vents.

Faulty Compressor

The compressor plays a crucial role in the air conditioning system by pressurizing and circulating the refrigerant. If the compressor is faulty or failing, it may not be able to adequately compress the refrigerant, resulting in warm air instead of cold air. Common signs of a failing compressor include loud noises when the air conditioner is turned on, reduced cooling performance, and visible leaks around the compressor unit. In some cases, a compressor failure may require replacement to restore proper functionality to the air conditioning system.

Blocked or Restricted Airflow

Another potential culprit behind warm air from your car’s air conditioner is blocked or restricted airflow. The air conditioning system relies on a clear pathway for air to flow from the evaporator coil, where the air is cooled, to the vents inside the cabin. If this airflow is obstructed by debris, such as leaves, dirt, or other debris, it can impede the cooling process and result in warm air blowing from the vents. Regularly inspecting and cleaning the air intake vents and cabin air filter can help prevent airflow restrictions and maintain optimal cooling performance.

Faulty Cooling Fans

Cooling fans play a vital role in dissipating heat from the condenser, which is responsible for converting hot, gaseous refrigerant back into a liquid state. If the cooling fans are not functioning correctly, they may fail to adequately cool the condenser, leading to reduced cooling efficiency and warm air from the air conditioner. Common issues that can affect cooling fan performance include electrical faults, worn bearings, or physical damage to the fan blades. Regular inspection and maintenance of the cooling fans can help identify and address any issues before they affect the performance of the air conditioning system.

Electrical or Sensor Issues

Modern cars are equipped with various sensors and electronic components that monitor and regulate the operation of the air conditioning system. If any of these components fail or malfunction, it can result in warm air blowing from the vents. For example, a faulty temperature sensor may inaccurately detect the temperature inside the cabin, causing the air conditioner to blow warm air when cold air is actually needed. Similarly, electrical issues such as corroded connectors or damaged wiring can disrupt the flow of power to critical components of the air conditioning system, affecting its performance. Diagnosing and repairing electrical or sensor issues often requires specialized diagnostic equipment and expertise, so it’s best to consult a professional mechanic for assistance.

Also Read: Essential Car Maintenance: Common Mistakes to Avoid

How do I keep my car’s AC from blowing warm?

Here are three common reasons why your car’s A/C might blow hot air, along with their solutions:

When refrigerant leaks, your air conditioning system may start blowing hot air. Spotting leaks in your refrigerant is difficult, so it’s best to have a professional check it. Mechanics can easily fix the leaks and refill the coolant.

If the compressor is broken, it can also cause your air conditioner to stop working as it is responsible for circulating refrigerant in your car. The hot air has no escape without your compressor. Compressors are tricky, so leave it to the experts. Remember that replacing compressors can be costly. 

AC problems can be caused by electrical issues too. Fortunately, your mechanic can quickly inspect your electrical system for any problems. Your mechanic can often resolve your issue by simply replacing a burned-out wire or fuse. 

Overall, it’s best to leave air conditioner problems to professionals. Although professional repairs can be slightly costly, they effectively solve the problem without any inconvenience to you. Visit Royal Top Gear for affordable car AC repair service in Dubai.

How to diagnose car AC problems?

If you think there are issues with your car AC, here are some steps to follow to diagnose car AC problems.

Check the airflow

To check the airflow in your car, start the engine and turn on the air conditioner. Wait for the system to warm up, start with the fan speed at its highest setting, and select the “Max AC” option if available. 

Check for strange sounds coming from the air conditioner. Listen with your ear against the vent. Unusual noises are a clear indication that something is wrong with your compressor. The problem may lie with either the clutch or the screws that are not properly holding the compressor.

The temperature of the air coming out of your vents can indicate the problem. If it’s hot outside, it should be 50-70 °F (10-21 °C), while if it’s cold outside, it should be 35-40 °F (2-4 °C). If it’s warm or room temperature, it could be due to insufficient refrigerant, leaking refrigerant, or a broken compressor.

Determine if the airflow in your car follows the same pattern as when it’s working properly by adjusting the AC to high or low settings. If there is sufficient airflow, blower motor problems can be ruled out. You most likely have a blower motor problem if there is no air flowing out of the vents. If the airflow significantly decreases as the speed is increased, your filter is probably the issue.

Check the air coming from the vents for cleanliness and unusual smells, which could indicate a leak in radiator fluid or a need to change the cabin air filter. It’s important to replace the AC filter every 15,000 miles, as a dirty filter can cause a car to smell musty or moldy.

Checking Under the Hood

To prevent airflow blockage and damage, clear any debris from your engine bay. Before you clean, remember to turn off the car.

Make sure to check the clutch while the AC is operating at a high speed. If there is no rotation, there is likely some sort of damage. Have a professional inspect it.

Check that the AC belt is properly installed and rotating. AC problems can occur due to a damaged or misaligned belt. 

Use a multimeter to check the AC fuse and make sure it’s functional. If the fuse blows, replace it, but if it happens again, consult a professional for a wiring problem.

Look at the ground under your engine bay to detect any refrigerant leaks. Additionally, check hoses for the presence of oil residue, which may indicate a leak. Get a professional to repair leaks and refill them.

Also Read: Importance of Regular Oil Changes for Your Vehicle in Dubai

How much does it cost to fix a warm AC in a car?

The air conditioning system is complex and requires multiple parts to function. If a faulty unit is found, it’s crucial to determine the issue. The specific issue you have will determine the cost of repairing it. To effectively repair the AC unit, you need to accurately diagnose and pinpoint the root cause of the issue. Fixing a leak can be challenging due to the possibility of multiple components causing it. To fix the issue, you may need to replace the O-rings along with the hoses. A worn O-ring won’t cost much to fix, but if there’s also a faulty compressor, the bill could be quite high. To avoid that situation, it’s important to stay on top of vehicle maintenance and be aware of any warning signs.


A malfunctioning air conditioner can quickly turn a pleasant drive into a sweaty, uncomfortable experience. By understanding the potential causes behind warm air from your car’s air conditioner, you can take proactive steps to diagnose and address the issue. Whether it’s low refrigerant levels, a faulty compressor, blocked airflow, or electrical issues, timely maintenance and repairs are essential for keeping your car’s air conditioning system running smoothly and ensuring that you stay cool and comfortable on the road, even on the hottest of days.

For more information and enquiries feel free to contact us ;

Email: info@rtgcadxb.com  

Mobile Number: +97142867086

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