Common car AC problems and their solutions - FourDoor

As ambient temperatures rise in the summer, the need for a fully functional car AC becomes essential for a comfortable ride. Yet, like any other system in the car, the AC can develop issues over time. The problems can range from a weak airflow to a refrigerant leak, and more can degrade the driving experience. A good knowledge of AC problems and their solutions can save you time, money, and frustration. We explain various AC issues, their causes, and practical solutions to help you keep the car’s AC in working order.

Common car AC problems and solutions

Let’s explore the common problems related to the car’s AC, including warm air from the vents, refrigerant leaks, strange noises, water leaks, compressor issues and more.

Weak airflow from AC vents

Issue: The airflow from the car’s AC vents is not blowing as strongly.

Cause: There could be multiple reasons for this issue; the cabin air filter is clogged, the vents could be blocked, or the blower is not performing correctly.

Solution: To counter this problem, you need to get the AC system inspected for the air filter and get it replaced if it is found clogged; a complete inspection of vents and the blower needs to be performed to find the core of the problem and service accordingly.

Warm air instead of cold

Issue: The car’s AC is blowing warm air instead of cold.

Cause: Warm air blowing through the vents can be caused by low refrigerant in the AC system or a faulty compressor.

Solution: Get the AC checked with a professional car AC repair centre for refrigerant recharge and compressor repair.

Strange noises from the AC system

Issue: There are strange noises or vibrations when you turn on the AC.

Cause: There could be many reasons for strange noise or excessive vibration: the compressor is faulty, damaged compressor bearing, worn-out compressor belt, loose mountings or faulty blower.

Solution: Opt for professional car AC inspection and repairs and explain the issues to an AC specialist.

Foul odours through the vents

Issue: The AC system in the car emanates a foul smell while running.

Cause: A foul smell from the AC is caused by a dirty cooling coil, cabin air filter or AC ducts in old cars. In some cars, insects or rodents can enter through air recirculation vents and cause a foul smell. 

Solution: To remove the foul smell, you must replace the cabin air filter and get the cooling coil and AC ducts thoroughly cleaned by a professional mechanic.

Water leaks inside the car

Issue: Water is leaking inside the cabin, when the car AC is running.

Cause: Water leaking from the AC system inside the car is usually caused by a clogged or damaged drain hose.

Solution: Assess the issue by checking the drain hose. Clear the drain hose or replace it if it is found damaged.

Compressor malfunction

Issue: The car AC compressor is not working, making noise while running or not switching on.

Cause: The AC compressor in the car may not be working, possibly due to a damaged electromagnetic clutch, worn-out compressor bearings or belt, damaged fuse, or mechanical failure.

Solution: Get these critical issues inspected by the nearest car AC service centre and let the experienced mechanics work on the compressor faults.

Refrigerant leaks

Issue: The car AC is not cooling correctly.

Cause: Leaks in the refrigerant lines or seals could be why the car's AC is not cooling correctly.

Solution: Refrigerant leaks cannot be assessed and repaired at home. Contact Fourdoor for AC repairs and gas charging.

Intermittent cooling

Issue: The AC does not cool consistently. Sometimes, vents blow cold air or warm air.

Cause: There could be electrical problems in the AC system or a faulty compressor clutch.

Solution: A complete inspection of wiring, connections and fuses is needed. The compressor clutch might require replacement.

Frozen AC system

Issue: The AC system freezes up and stops working.

Cause: The evaporator coil is frozen due to a low refrigerant level, clogged drain hose, clogged air filter, blocked air ducts or a faulty expansion valve.

Solution: Get the cabin air filter inspected and replace it if found clogged. Ensure to top-up refrigerant back to nominal level.

Unpleasant chemical smell

Issue: The car’s AC vents are emitting a chemical-like smell.

Cause: The refrigerant of the car’s AC system is leaking, causing a chemical like smell in the cabin.

Solution: A proper leak inspection of the complete AC system is required. Once the leaks are identified, get the lines and components repaired or replaced.

Additional tips for maintaining the car’s AC

Regular Maintenance: Schedule regular car AC inspections to identify issues early.

Proper Use: Keep the temperature moderate to balance cooling and fuel efficiency.

Stay Clean: Keep the car’s interior clean to prevent dirt, dust and debris from entering the AC system. Get a thorough AC cleaning at least once a year.

Check Filters: Regularly replace cabin air filters to maintain proper airflow and air quality.

Run AC in Winter: Running the car’s AC occasionally in winter helps keep the system odour-free, clean, and lubricated.

Conclusion

Maintaining the car’s AC is crucial for a comfortable ride, especially during hot weather. By understanding common problems and their solutions, you can keep the AC running smoothly. Regular maintenance and proper use will help extend the life of the car’s AC system, ensuring you stay cool and comfortable on the road.

FAQs

Q. What are the common car AC problems and solutions?
Common problems include weak airflow, leaking refrigerant, inadequate performance, squeaky belts, etc., and their solutions are to get the ducts cleaned, refrigerant top up, servicing condenser and evaporator coil, and replacing your cabin filter regularly.

Q. How do I know what's wrong with my car AC?
The best way to know the problems related to your car AC is to get it inspected by a professional car garage.

Q. How to fix the car AC not blowing air?
There could be multiple reasons for car AC to not blow air, such as clogged air filter, blocked vents, or the blower not performing correctly.

Q. Why is my AC running but not cooling in my car?
If your car's AC is running but not cooling the cabin, the reason should be low refrigerant. You must get the AC gas topped up at a reliable car AC service centre.

Q. How to fix a weak AC in a car?
There could be multiple reasons for a weak car AC. It is best to get it inspected by an experienced car AC mechanic near you.