Rear AC Not Working : Causes and Solution

The reason your rear ac is not working may be due to a faulty compressor or low refrigerant levels. If your rear ac is not working, the cause may be a malfunctioning compressor or a refrigerant leak.

The compressor could be failing because of a faulty clutch, wiring issues, or damaged mechanical components. Low refrigerant levels may be due to a leak in the system. Other potential reasons for rear ac issues include a broken blower fan or clogged air filters.

To diagnose the problem, it’s best to take your vehicle to a qualified technician who can troubleshoot the issue and provide you with a solution. Regular maintenance of your air conditioning system can also prevent issues from arising, and it’s recommended to have it serviced before summer heat sets in.

Reasons For Rear Ac Not Working

Are you experiencing a lack of cool air from your rear ac vents? This can be a frustrating and uncomfortable experience, especially during hot summer months. Several issues could lead to this problem, and identifying them is crucial to fix it promptly.

Blocked Or Dirty Air Filter

The air filter in your vehicle keeps the air that circulates in the ac system free of contaminants and debris. Over time, it collects dust, dirt, and debris, becoming clogged and restricting airflow. A blocked or dirty air filter can affect how well your ac system works, including cooling performance.

  • Restricted air flow can lead to reduced cooling ability, resulting in warm air from the back vents.
  • A defective air filter can allow impurities, such as dust and dirt, to enter your ac system, causing contamination and damage.
  • Be sure to replace your ac filter regularly according to your car’s manufacturer’s guidelines to avoid issues resulting from a blocked or dirty air filter.

Malfunctioning Ac Fan

The ac fan is responsible for circulating cooled air into the passenger compartment. A malfunctioning fan can cause your ac system to work inefficiently and inadequate cooling capacity.

  • An ac fan that fails to work can cause reduced cooling output due to a lack of airflow.
  • Noisy sounds from the fan or a squealing noise can also indicate an issue with it.
  • It’s important to have your car’s fan checked by a professional mechanic to avoid a complete breakdown of the ac system.

Low Refrigerant Levels

Refrigerant gas is a vital element in the ac system that cools the air and sends it to different vents. A lack of refrigerant can lead to a decrease in cooling capacity, leading to warm air instead of cool air.

  • A decrease in refrigerant levels can lead to less cooling output from the ac system.
  • A low refrigerant level is a typical sign of a refrigerant leak in the ac system.
  • Always contact a certified mechanic to examine and fix refrigerant issues.

Faulty Ac Compressor

The ac compressor compresses the refrigerant gas, enabling the ac system to work efficiently. A malfunctioning ac compressor can lead to warm air seeping from the rear ac vents.

  • A defective ac compressor can cause the system to work inefficiently, leading to less cooling power.
  • Grinding noises or unusual sounds coming when turning on the ac system indicates the existence of a compressor issue.
  • Contact a certified mechanic to check on the ac compressor if you face such issues.

By understanding the reasons for rear ac not work, you’re better equipped to troubleshoot further and avoid costly repairs. However, for best results, you should always let a qualified technician handle the complex parts of your ac system to prevent further damage or malfunctioning.

Rear Ac Not Working? Here Are Some Solutions!

As the mercury rises outside, there’s nothing worse than turning on your car’s ac and realizing that the ac in the back seat isn’t functioning. If you’re going to be traveling with your family or friends, having a malfunctioning rear ac unit can be frustrating and uncomfortable.

In this blog post, we’ll share some solutions to fix your rear ac unit. To get started, let’s first understand why your rear ac might not be working.

Regular Maintenance

Just like any other component in your car, the rear ac unit requires regular maintenance to function efficiently. By taking some necessary steps, you can ensure that your ac unit performs well, and your passengers don’t face any discomfort.

  • Change the ac filter regularly. A clogged air filter can prevent the ac unit from working correctly.
  • Check for loose connections and damaged parts. Any leaks, cracks, or loose wires can prevent the system from functioning—the rear ac unit can lose its refrigerant through these leaks.
  • Make sure the cooling fan is working correctly. If the fan isn’t working, it can lead to overheating, which can damage the ac unit.

Diy Fixes

Your rear ac unit might stop working due to some minor issues, and you may be able to fix them on your own.

  • Check the fuses: if your ac fan suddenly stops working, it may be due to a blown fuse. Check the fuse box and replace any blown fuses.
  • Clean the condenser: the condenser can get dirty and clogged, preventing the ac unit from working correctly. Clean it to ensure that the ac performs optimally.
  • Add refrigerant: if you notice that the ac isn’t cooling as well as it should, you may need to add refrigerant. Purchase a refrigerant refill kit and add refrigerant per the instructions.

Professional Repairs

If diy fixes don’t work, it’s time to consult a professional.

  • A blown compressor: if your ac unit suddenly stops working, it may be due to a blown compressor. A mechanic will need to replace the entire compressor unit.
  • A refrigerant leak: if there’s a refrigerant leak, you’ll need to seek a professional’s help to fix the leak and refill the refrigerant.
  • A faulty thermostat: if your thermostat has gone bad, it’ll need replacing. A professional can test the heating and cooling system and identify if your thermostat needs replacing.

If your rear ac unit isn’t working, take some simple steps to maintain the unit regularly. Try some diy fixes before you consult a professional. If the diy tricks don’t work, seek a professional’s help. By following these suggestions, you’ll remain cool and comfortable in the scorching heat.

Prevention Tips For Rear Ac Not Working

Avoiding Common Causes

There are a few common causes of rear ac not work, and preventing these issues can help you avoid costly and time-consuming repairs down the line.

  • Don’t overwork the system: the rear ac often has to work harder than the front ac to cool down the back of the vehicle, so it’s important not to overwork the system. Avoid running the ac on high for long periods, and give the system a break occasionally.
  • Make sure the vents are clear: if the vents in the back of the vehicle become blocked or clogged, the ac may not be able to cool down the area effectively. Check the vents regularly and clear any debris that may be blocking them.
  • Keep the air filter clean: a dirty air filter can also cause rear ac problems, as it can restrict airflow and make it difficult for the system to cool down the vehicle. Be sure to change the air filter regularly to avoid blockages.

Simple Maintenance Tips

Preventing rear ac problems doesn’t have to be difficult or expensive.

  • Check for leaks: regularly check the rear ac system for leaks, which can cause it to lose refrigerant and become less effective. If you notice a leak, have it repaired immediately.
  • Clean the condenser: the condenser is an important part of the ac system that helps release heat, and it can become dirty or clogged over time. Clean the condenser regularly to help ensure proper functioning of the system.
  • Check the compressor belt: the compressor belt is responsible for powering the ac system, so it’s important to make sure it’s in good condition. Check the belt regularly for signs of wear or damage, and have it replaced if necessary.

Following these prevention tips and simple maintenance tips can help keep your rear ac working effectively and avoid the inconvenience of costly repairs. Regular checks and maintenance of the system can help extend its lifespan and ensure optimal performance.


A malfunctioning rear ac can be a frustrating issue to face. However, there are a few steps you can take to troubleshoot and diagnose the problem. From checking the air filters to inspecting the electrical wiring, narrowing down the root cause of the issue can help you find the appropriate solution.

If you are not confident in your ability to fix the problem, it is always best to consult a professional mechanic who can identify and repair the issue. Remember, regular maintenance checks and swift repairs can prevent future problems and save you time and money in the long run.

Don’t let a faulty rear ac system ruin your driving experience – take action today to ensure your vehicle stays cool and comfortable.