Why is My Rear AC Not Working : Causes And Solution

The rear ac not working is likely due to a malfunctioning component or low refrigerant levels. This can result in warm air blowing through the rear vents instead of cool air. When you have a large family and you’re planning on driving for extended periods, a functioning air conditioning system is critical. However, you might find that your car’s rear air conditioner isn’t working, even if the front one is. There are a few reasons why rear ac not working may occur, and this issue is almost always caused by a malfunctioning component or low refrigerant levels.

This can cause warm air to blow through the rear vents rather than cool air, which can be quite unpleasant for passengers, particularly on long road trips. Quite a few potential causes can contribute to rear ac issues, so it’s best to start by troubleshooting the most typical ones to pinpoint the exact problem.

Common Causes Of Rear Ac Not Working

If you’re wondering why your rear ac is not working, there could be several reasons that need to be checked before scheduling an appointment with your mechanic. In this blog post, we will discuss the most common causes of rear ac not working and how to troubleshoot them.

Low Refrigerant Levels

Refrigerant is a key component of your vehicle’s ac system, which cools the air before it enters the cabin. Low refrigerant levels can cause your rear ac to stop working altogether, leaving you with warm air inside your vehicle.

  • Leaks in the system
  • Faulty ac components
  • Normal wear and tear

If you suspect low refrigerant levels, contact your mechanic to diagnose the source of the issue.

Faulty Ac Compressor

The ac compressor is the engine of your vehicle’s ac system, responsible for compressing and circulating refrigerant gas. If the ac compressor is not functioning properly, your rear ac will not work correctly, and you will feel warm air inside your vehicle.

  • Electrical issues
  • Overheating
  • Normal wear and tear

Check your ac compressor for signs of leaks or wear and tear, and take it to a mechanic if you suspect any issues.

Clogged Ac Condenser

The ac condenser is responsible for converting refrigerant gas into a liquid form, which cools the air as it passes through. Over time, the ac condenser can become clogged with debris (such as leaves or dust), causing the ac system to malfunction.

Check your ac condenser and fins regularly to spot any signs of clogging.

Damaged Rear Ac Blower Motor

The ac blower motor is responsible for blowing cold air into your vehicle’s cabin. If it is damaged or not working correctly, you will feel warm air inside your vehicle.

  • Overuse
  • Electrical failures
  • Lack of maintenance

If you suspect that your rear ac blower motor is damaged, take your vehicle to a mechanic for inspection.

By understanding the common causes of rear ac not working, you can troubleshoot the issue before scheduling a professional appointment. Check your refrigerant levels, ac compressor, ac condenser, and ac blower motor to identify the source of the problem, and seek professional help if required.

How To Diagnose The Issue With Rear Ac

Are you having trouble with your rear ac? A faulty air conditioner can be frustrating, especially during the summer months. However, before you consider calling a repair expert, it is wise to diagnose the issue first. In this article, we provide a step-by-step guide to help you diagnose rear ac issues.

Let’s get started.

Step-By-Step Guide To Diagnosing Rear Ac Issues

  • Check for blown fuses: a blown fuse can interrupt the power supply to your rear ac. Check the fuses of the ac and replace any blown ones.
  • Check the thermostat: the thermostat is responsible for regulating the temperature in the ac system. Ensure that it’s set correctly, and the batteries are not dead.
  • Check the refrigerant levels: refrigerant cools the air, and low levels could be the cause of the issue. Use a pressure gauge to test the refrigerant levels and refill if necessary.
  • Check the compressor: the compressor is responsible for circulating the refrigerant throughout the system. Check if it’s damaged or needs repairing or replacement.

Tips For Identifying The Root Cause Of The Issue

  • Pay attention to experiencing only hot air or no air while the ac is on. This helps you identify which part of the system to investigate.
  • Check for leaks: leaks in the ac system could be the cause of low refrigerant levels. Use a leak detection kit to find and fix the leaks.
  • Inspect the air ducts: dirty, blocked, or damaged air ducts can inhibit airflow leading to low cooling levels or hot air. Clean or replace dirty and damaged ducts.
  • Look for visible damage or wear and tear to the ac system components. Finding worn out or damaged components helps you replace or repair the specific part of the system.
  • Regular maintenance of the ac prevents likely breakdowns.

Diagnosing and fixing a faulty air conditioner in your vehicle can be manageable with the right information and steps. Following this guide can save you time and money before buying spare parts or calling a repair expert. By maintaining your air conditioning system, you’ll enjoy a comfortable ride without worrying about system failure or breakdown.

Solutions To Rear Ac Not Working

Are you feeling uncomfortable in your car due to the rear ac not working? It’s a common issue that drivers face, especially during hot summer months. Here, we will explore the possible solutions to your rear ac not working problem.

Refilling Refrigerant Levels

  • Low refrigerant levels can be the reason behind the malfunctioning of your rear ac.
  • You can refill the refrigerant levels to solve this issue.
  • You can either do it yourself by buying a refrigerant refill kit or take your car to a professional mechanic.

Replacing Faulty Ac Compressor

  • A faulty ac compressor can be the reason why your rear ac is not working.
  • If the compressor fails, it will stop cooling the air that passes through the system.
  • You need a professional mechanic to replace the compressor, which can be an expensive fix.

Cleaning Clogged Ac Condenser

  • The air conditioning condenser can get clogged with dirt, debris or bugs, leading to restricted airflow that can prevent the rear ac from working correctly.
  • Cleaning the condenser can solve this issue.
  • You can use a garden hose or compressed air to clean the condenser yourself, or you can take it to a mechanic.

Repairing Or Replacing Damaged Rear Ac Blower Motor

  • A damaged rear ac blower motor can also cause the ac system to malfunction.
  • The blower motor is responsible for blowing cool air from the ac system into the car’s cabin.
  • If the motor is damaged, it needs a professional mechanic to repair or replace it.

By following these solutions, you can solve your rear ac not working problem. Regardless of the solution you choose, it’s best to consult a professional mechanic to ensure the problem is fixed properly.


After exploring the reasons behind a non-functioning rear ac system, it becomes evident that this issue can stem from a variety of causes. These reasons might include low refrigerant levels, a damaged compressor, a faulty thermostat or blend door, or even a clogged air filter, among others.

As a car owner, troubleshooting ac issues can be frustrating and time-consuming, but taking prompt action to address the problem is necessary for the well-being of your vehicle and your own comfort. Regular maintenance and preventive measures, such as having routine check-ups with a professional mechanic, can help prevent ac problems in the future.

Remember, a properly functioning ac is essential for a comfortable ride, especially in hot summer months. So, if you suspect that your rear ac is not working, don’t hesitate to take it to a professional and get it fixed.

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