Common Toyota Corolla A/C Problems

Toyota Corolla A/C systems are complex, and when they start acting up, identifying the culprit can be challenging. Below are some of the most common problems you’ll run into, what they mean, and how to address them.


If you notice A/C leakage, it might be an indication that the pipe is being blocked, or your condensate pump is no longer working. Lint, dirt and leaves can accumulate over time, and once the drainage pan becomes filled up, the air conditioning and any components near it can sustain damage. This is why the drain pan should be inspected every so often and you will want to review the pipes to ensure no leaks are present.

The Capacitor Has Burnt Out

When the capacitor becomes faulty, the air conditioning fans won’t engage properly. These components are responsible for giving the jolt that is required to start up the A/C motor. If you hear a clicking sound, this is a sign that your capacitor is worn. A humming sound however means that the motor is trying to start. Capacitors should only be replaced by a technician as the presence of leaking oil can be hazardous to the inexperienced.

The Contractor Is Faulty

The contractor functions as the electrical switch, which turns the A/C off and on so that the desired temperature is obtained. Like all car parts, they are subject to wear as time passes and when this occurs they are a source of trouble for the compressor, condenser fan and blower. While it is possible to replace this part DIY, it takes in-depth knowledge and skill.

The A/C Filter Is Dirty

When an A/C filter becomes dirty, this will adversely impact airflow.  If the clogging becomes severe enough, the air conditioning might freeze up completely. The good news about this problem is that it can be resolved without needing to call a specialist, so long as you follow the recommended guidelines of the manufacturer and purchase the proper filter. At minimum, the filter should be replaced once a year, and when shopping for a new one it is essential to choose a model with the correct dimensions so it fits into your vehicle.

Problems With Electrical Wiring

The Toyota Corolla uses a variety of electrical components, and while these provide a number of advantages, the wiring can wear down over time. If you notice that the A/C isn’t putting out any air, you will want to inspect the breaker box, because the issue could have been caused by a power surge. However, if the breaker continues having issues, this almost certainly means you have a wiring problem, most likely a short. This issue is serious because if left unaddressed it could lead to a fire, so it should be handled as soon as possible.

Recalibrate The Thermostat

The first thing you should do when encountering A/C problems is to check your thermostat. Sometimes it has the wrong settings or has been mistakenly turned off. If this doesn’t work, try recalibrating it until you get the desired temperature.