5 Steps to Diagnose and Fix Car’s Low AC Cooling: Expert Tips and Advice

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Low AC Cooling Expert Tips and Advice
Air condition dial in a car


Are you tired of driving in a hot and stuffy car during the summer months? If your car’s AC system isn’t functioning properly, it can make your daily commute a frustrating and uncomfortable experience. If you’re in this situation, don’t panic! In this article, we’ll guide you through how to diagnose the reason for low AC cooling and provide tips on how to fix the problem.

Diagnosing the Reason for Low AC Cooling

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Professional car mechanic working in auto repair service.

There are several reasons why your car’s AC may not be providing sufficient cooling. Here are some steps you can take to diagnose the issue:

  1. Check the Air Filters: Dirty air filters can restrict air flow and decrease the cooling capacity of your AC. Check your car’s air filters and clean or replace them if needed.
  2. Inspect the Compressor: The compressor is responsible for compressing the refrigerant and circulating it through the AC system. A malfunctioning compressor can cause low cooling. Check the compressor for any visible damage or leaks.
  3. Look for Leaks: Refrigerant leaks can cause low cooling and damage to the AC system. Inspect the AC system for any signs of leaks, such as oil stains or wet spots.
  4. Check the Evaporator: The evaporator is responsible for removing heat from the air that passes through the AC system. If the evaporator is dirty or clogged, it can reduce the cooling capacity of your AC. Check the evaporator and clean it if necessary.
  5. Test the Thermostat: The thermostat regulates the temperature of the air that flows through the AC system. If the thermostat is faulty, it can cause low cooling. Test the thermostat and replace it if needed.

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Fixing the Low AC Cooling Problem

car diagnostic professional
car diagnostic professional

Once you’ve identified the reason for low AC cooling, you can take steps to fix the problem. Here are some tips:

  1. Clean or Replace Air Filters: If your car’s air filters are dirty, clean or replace them. This can improve air flow and increase the cooling capacity of your AC.
  2. Repair or Replace the Compressor: If the compressor is malfunctioning, you may need to repair or replace it. Consult a mechanic for advice on the best course of action.
  3. Fix Refrigerant Leaks: If there are refrigerant leaks in the AC system, you’ll need to fix them to restore cooling capacity. This can involve repairing or replacing damaged components and recharging the system with refrigerant.
  4. Clean the Evaporator: If the evaporator is dirty or clogged, clean it using a specialized AC cleaner. This can improve the cooling capacity of your AC.
  5. Replace the Thermostat: If the thermostat is faulty, replace it with a new one. This can ensure that the temperature of the air flowing through the AC system is regulated properly.

Preventing Low AC Cooling in the Future

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To prevent low AC cooling in the future, follow these tips:

  1. Regularly clean or replace your car’s air filters.
  2. Have your AC system inspected and serviced by a qualified mechanic at least once a year.
  3. Avoid overusing your car’s AC system. Use it only when necessary, and turn it off when you don’t need it.
  4. Park your car in shaded areas whenever possible to reduce the temperature inside.
  5. Roll down your windows and use natural ventilation to cool your car whenever possible.


Low AC cooling can be a frustrating problem to deal with, especially during hot summer months. By following the steps outlined in this article, you can diagnose the reason for low AC cooling and take steps to fix the problem. Remember to take care of your car’s AC system to prevent future cooling issues.

1. Car AC Not Cooling? Here’s What Might Be Wrong” by YourMechanic
2. 5 Reasons Why Your Car’s A/C Isn’t Working” by Angie’s List