Auto AC Repair Basics

Tell Me Something About My Car’s AC -- Dave’s Ultimate Automotive

You don’t need it until you need it, but when you’re ready to turn on your car’s AC, you assume and hope it will work. Perhaps you wish you knew a little more about how a vehicle's air conditioning system works, what might go wrong, and which signs to look for. Worry no more! For expert service and repairs, as well as a few basic facts, rely on Dave's Ultimate Automotive in Round Rock, Texas. Our ASE-certified technicians are here to help you with any make or model, and we back our work with a generous nationwide warranty through the NAPA autocare network.

How It Works

Regardless of what brand auto you own, AC systems generally work the same way. They work using high-pressure gas refrigerants. As air passes through, the evaporator removes heat from the air before allowing it to go into the passenger cabin. That heat is transferred into the refrigerant. To make this process work, the compressor compresses the refrigerant into a liquid and sends it through a tube to the condenser. The condenser cools the refrigerant and moves it toward the orifice tube/expansion valve. The refrigerant changes back into a gas form and goes to the drier or accumulator. Here, moisture is removed from the refrigerant, it returns to the evaporator, and the cycle continues. Despite the rumors you may have heard, it doesn't take more fuel to operate your auto's AC. In fact, open windows increase drag and may cost more than turning on the air.

Common AC Repairs

While we'll need to check out your car to make an accurate diagnosis, there are some common repairs and signs for you to be aware of. An electrical problem such as a broken wire, for instance, may result in the AC system not having power to operate. Also, anything airborne can puncture or block the condenser, resulting in improper heat exchange. If the compressor stops working, the refrigerant can't circulate. Furthermore, if the fan(s) don't work, the condenser can't cool. This will render the refrigerant too warm to cool the car. The blend air door allows warm and the cool air to mix to achieve your specified temperature. If this gets stuck, only warm air enters the passenger area. A hole anywhere in the system will allow refrigerant to leak. The resulting lowered level will also cause improper cooling.

Help for Your Vehicle’s AC

Whether you’re ready for maintenance services, need a repair, or just want to know more, Dave’s Ultimate Automotive is your go-to shop for help with your car’s AC. Pay us a visit, experience our commitment to excellence, and see why we’re designated as a top shop.

Written by Dave's Ultimate Automotive