Mazda 6 AC Compressor Not Coming On: 3 Quick Fixes

Is your Mazda 6 AC compressor not coming on? Thankfully, this detailed guide will equip you with the knowledge you need to troubleshoot and potentially resolve this issue yourself.

Mazda 6 AC Compressor Not Coming On
Image Source: Wikimedia Commons

Consult the User Manual

Your Mazda 6 user manual contains valuable information about your vehicle, including the AC system. Check the index to locate the section on the AC system. Here, you’ll find diagrams, part descriptions, and potentially some basic troubleshooting advice tailored to your model. Familiarize yourself with these details; they’ll come in handy when you’re inspecting the AC system.

Check the AC Fuse

The fuse serves as a safety device that protects the electrical circuits in your car. If the AC isn’t working, a blown fuse could be the simplest reason. Here’s how to perform a thorough fuse check:

Locate the Fuse Box: In most Mazda 6 models, you’ll find one fuse box under the dashboard and another in the engine compartment. Refer to your user manual to identify the correct box for AC-related fuses.

Identify the AC Fuse: Each fuse box has a diagram either in the user manual or on the inside of the fuse box lid. Locate the fuse that corresponds to the AC system.

Remove and Inspect the Fuse: Turn off the car’s engine. Carefully remove the identified fuse using a fuse puller or needle-nose pliers. Look at the metal strip inside the fuse. If it’s broken, the fuse is blown and needs to be replaced.

Replace the Fuse: Buy a new fuse with the same amperage rating as the one you removed. Insert the new fuse into the empty slot.

Test the AC: Start the car and turn on the AC. If the compressor comes on, the problem was the blown fuse, and you’ve fixed it.

If replacing the fuse doesn’t resolve the issue, proceed to the next section for further diagnostics.

Examine Electrical Connections

Electrical issues can often disable your AC compressor. A disconnected wire or a corroded terminal can disrupt the electricity flow, preventing the compressor from turning on. Here’s how to check:

Turn Off the Engine: Always ensure the car’s engine is off when working with electrical components to avoid any risk of shock.

Locate the AC Compressor: This is generally located at the front of the engine compartment and is connected to the serpentine belt. Your user manual can help you find it if you’re unsure.

Inspect the Wires: Look for any loose connections, frayed wires, or signs of corrosion on the terminals. Use a flashlight for better visibility.

Secure and Clean: Tighten any loose connections with a wrench. Clean corroded terminals using a wire brush. If any wires are frayed or damaged, they may need to be replaced.

If the electrical connections look good but the issue remains, continue to the next diagnostic step.

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Inspect Refrigerant Levels

The refrigerant is the liquid that circulates through the AC system and actually cools the air. If the levels are too low, the compressor won’t engage as a safety precaution. Here’s how to check it:

Purchase an AC Pressure Gauge: This tool is available at most auto parts stores and is essential for checking refrigerant levels.

You can get this OMT AC Manifold Gauge Set from Amazon

Identify the Service Ports: Your AC system has high-pressure and low-pressure service ports. You’ll be checking the low-pressure port, usually found on the larger of the two aluminum pipes that come out of the compressor.

Attach the Gauge: Start by removing the cap from the low-pressure port. Attach the AC pressure gauge by following the instructions that come with the gauge.

Check the Pressure: Turn the engine and AC on. Look at the gauge reading and compare it to the recommended pressure levels in your user manual.

Add Refrigerant if Necessary: If the pressure is lower than the recommended range, you’ll need to add refrigerant. Most refrigerant kits come with a hose to add the liquid through the low-pressure port. If you’re not comfortable performing this task, consult a professional.

Seek Professional Help

If you’ve gone through all these steps and the AC compressor still isn’t working, it’s time to consult a qualified mechanic. Specialized diagnostics tools and expertise are often required to resolve more complex issues.

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