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Why did my Subaru AC suddenly stop working?

If your Subaru's air conditioning (AC) system has suddenly stopped working, there could be a few potential reasons. The most common causes include issues with the compressor, refrigerant leaks, electrical problems, or a faulty thermostat. Let's explore these potential problems in more detail.

Compressor Issues

The compressor is the heart of your Subaru's AC system, and if it fails, the entire system will stop working. Compressor issues can be caused by a variety of factors, such as wear and tear, lack of lubrication, or electrical problems. If the compressor is not functioning properly, you may need to have it repaired or replaced by a qualified mechanic.

Refrigerant Leaks

Your Subaru's AC system relies on a specific amount of refrigerant to operate effectively. If there is a leak in the system, the refrigerant will slowly escape, and the AC will eventually stop working. Refrigerant leaks can occur in various components, such as the hoses, seals, or the condenser. A mechanic can perform a leak test to identify the source of the leak and make the necessary repairs.

Electrical Problems

The AC system in your Subaru is controlled by an electrical system, and any issues with the wiring, fuses, or relays can cause the system to stop working. If you suspect an electrical problem, it's best to have a mechanic diagnose and repair the issue to ensure the proper functioning of your AC.

Thermostat Malfunction

The thermostat in your Subaru's AC system is responsible for regulating the temperature of the refrigerant. If the thermostat is not functioning correctly, it can cause the AC to stop working or not cool the cabin effectively. A malfunctioning thermostat may need to be replaced by a mechanic.

If your Subaru's AC has suddenly stopped working, it's important to have it inspected by a qualified mechanic as soon as possible. They can diagnose the issue and recommend the appropriate repairs to restore your vehicle's cooling system to full functionality.

Why did the AC in my car stop working all of a sudden?

A car's AC can stop working suddenly due to low refrigerant from a leak, electrical issues like a blown fuse or faulty switch, or a mechanical failure of components like the compressor or condenser. Other possible causes include a clogged cabin air filter, a broken drive belt, or a failed blower motor.
This video explains how to diagnose common car AC problems: 59sO'Reilly Auto PartsYouTube · Sep 4, 2020
Common causes and potential solutions

Low refrigerant: This is one of the most common causes, often due to a leak in the system.
- Solution: A professional needs to add a leak tracer dye, run the system, find the leak with a blacklight, and then repair it.
Electrical problems: Issues with fuses, relays, switches, or wiring can stop the AC from working.
- Solution: Check for a blown fuse or a faulty switch, but a professional may be needed for more complex wiring issues.
Faulty compressor: The compressor is the heart of the AC system; if it fails, the refrigerant can't circulate.
- Solution: A failing compressor will likely need to be replaced.
Clogged condenser: The condenser, located at the front of the car, can get blocked by debris.
- Solution: Inspect and clean the condenser, which sits in front of the radiator.
Clogged cabin air filter: A dirty filter can restrict airflow, making the AC seem weak or non-functional.
- Solution: Check and replace the cabin air filter if it's dirty.
Broken drive belt: A broken belt can prevent the compressor from running.
- Solution: A mechanic will need to replace the broken belt.
Cooling fan failure: The fans help move air over the condenser; if they fail, the system will not cool properly.
- Solution: Check if the cooling fans are working. A professional can diagnose and fix any issues with the fan motor or circuit.

How to tell if an AC fuse is blown in a car?

You can tell if an AC fuse is blown by a visual inspection for a broken or burnt filament inside the fuse or by using a multimeter to test for continuity. A broken, continuous metal strip inside the fuse is a clear sign of a blown fuse. If the fuse is too dark to see through, or if it blows again immediately after replacement, it is likely blown and indicates a further problem with the AC circuit.

How to check for a blown AC fuse
1. Visual inspection

Locate the fuse box: The main fuse box is often in the driver's side footwell, but some cars have other fuse boxes.
Remove the fuse: Turn the car off. Use a fuse puller or needle-nose pliers to remove the suspected AC fuse.
Inspect the fuse: Hold the fuse up to a light. A good fuse has a continuous metal filament running through the center.
Identify a blown fuse: A blown fuse will have a broken or melted metal strip inside. You may also see black or brown burn marks on the fuse.

This video demonstrates how to visually inspect a fuse for a blown condition: 58sHelpful DIYYouTube · Dec 31, 2015
2. Using a multimeter

Set the multimeter: Set the meter to the continuity or ohm setting.
Test the fuse: Place the meter's probes on each metal tab of the fuse.
Read the results:
- Good fuse: The meter will show continuity or a reading close to the resistance of the leads.
- Blown fuse: The meter will show no continuity (an open circuit).

This video explains how to use a multimeter to test a fuse for continuity: 46sBarbour's Auto HelpYouTube · Jul 16, 2019
If the fuse continues to blow

If the new fuse blows again immediately, there is a short in the circuit that needs to be diagnosed.
This could be due to a failing AC compressor or other electrical issues.
It is best to consult a professional mechanic in this situation to prevent further damage.

How much to fix AC in Subaru?

On average, the cost for a Subaru Forester Car AC Repair is $372 with $176 for parts and $196 for labor. Prices may vary depending on your location.

Why did my AC stop working in my Subaru?

The air conditioner will likely stop working altogether if it has a refrigerant leak. Leaks can impact the air conditioner's cooling ability over time. A Subaru's engine relies on refrigerant, which absorbs heat, converts it into a gas, and then releases it as a liquid as it transforms back into a gas again.

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.