Does My Car's AC Use Gas?
If you're like most drivers, you enjoy using your vehicle's air conditioning (AC) from time to time, especially in extreme heat. You may have wondered whether using the AC in your car affects its fuel efficiency. If you're looking for ways to improve gas mileage and save money at the pump, you may want to know if turning off the air conditioning is the answer. Review this guide from Freedom Chevrolet Chrysler Dodge Jeep Ram to learn more about your vehicle's AC system.
Does a Vehicle's AC Use Gas?
Yes, a vehicle's air conditioner uses gas — but you don't have to sweat it (literally). When you use the air conditioning in your vehicle, it comes from the alternator, which is powered by the engine. Because fuel powers the engine, air conditioning uses gas when it's running. However, air conditioning only causes a slightly larger load on the engine. Most drivers won't even notice the increased gas consumption when using the much-needed AC on a sweltering summer day in Illinois.
How Vehicle AC Works
Have you ever stopped to wonder how the AC works in your vehicle? Most AC systems function the same, regardless of the make or model of the vehicle you drive. A vehicle's AC system converts a high-pressure gas, known as refrigerant, into a liquid state and then cycles it back into a cooler gas that blows into the cabin. Here are the components that make this process possible:
- Compressor: Quite literally, this component compresses the refrigerant into a fluid so it can flow into the condenser.
- Condenser: When the refrigerant enters the condenser, it's hot. The condenser removes the heat and cools the refrigerant.
- Expansion valve or orifice tube: Vehicle AC systems have either an expansion valve or an orifice tube, which are similar components responsible for cycling the refrigerant back into a gaseous state.
- Receiver/dryer: This component removes any excess moisture from the refrigerant and filters the gas to eliminate dust, dirt, and other debris.
- Evaporator: Similar to a radiator, the evaporator has lines for the refrigerant to flow through, which absorb heat from the air. Cold air can then flow behind the evaporator, which is what enters the cabin when you turn on the AC.
Is It Inefficient To Use a Vehicle's AC?
A common myth is that it's inefficient to use a vehicle's air conditioning, but it's not exactly true. When you're driving at higher speeds along the highway, it's fairly efficient to use the AC system. In fact, it's more efficient to use the AC than rolling down the windows when you're driving down the open road. Opening one or more windows reduces the vehicle's aerodynamics and increases resistance, which means the engine has to work harder. When this happens, the engine uses more fuel, causing greater inefficiency.
When you're running errands across town, however, it may be better to roll down the windows. Idling in stop-and-go traffic while you have the AC running can use more gas than simply rolling down the windows. However, it's always better to be comfortable in your vehicle because it reduces the risk of distracted driving. So don't beat yourself up if you find yourself cranking the air conditioner at full blast on a 90-degree day.
How To Be More Fuel-Efficient
In addition to rolling down the windows at slower speeds, there are plenty of other ways you can aim to be more fuel-efficient while driving. Not only does fuel-efficient driving help you save money, but it can have significant environmental impacts. Here are a few ways you can improve your vehicle's fuel efficiency:
Keep Your Tires Inflated
Properly inflating your tires can have a big impact on your gas mileage. Underinflated tires create more resistance, which uses more gas and reduces fuel economy. Use a tire pressure gauge to check your vehicle's tires and inflate them in a timely manner if they're low.
Avoid Idling
Excessive idling can waste fuel unnecessarily, resulting in poorer gas mileage. If you hit heavy traffic and you know you won't be moving for a while, shut off your engine to preserve fuel. Restarting the engine is more fuel-efficient than idling for one minute or longer.
Brake Slowly
Hard and abrupt braking can lower fuel economy. Instead, it's better to coast to a stop slowly. Whether you're sitting in stop-and-go traffic or cruising along the highway, be aware of your surroundings to reduce the chance of a sudden stop. These actions can help you use the brakes less, which can increase fuel efficiency.
Maintain Your Vehicle
Following a routine maintenance schedule for your vehicle is one of the best ways you can improve gas mileage. Make sure you're taking your vehicle to an auto dealership or repair shop for regular oil changes, tire rotations, and other scheduled maintenance services.
Does a Vehicle's Heat Use Gas?
Technically, your vehicle's heating system uses gas. The heating system is part of the engine, which uses gas to run. Unlike the vehicle's AC system, however, the heating system doesn't have any impact on the vehicle's fuel efficiency.
The heating system uses a different process than AC to blow warm air into the cabin, though both systems require many of the same components, such as the compressor and condenser. While the AC uses these components to produce cold air, the heating system uses them to recycle the heat produced by the engine. Any extra fuel the heating system may require to warm up the cabin is minimal and won't affect the vehicle's fuel efficiency.
Schedule a Service Appointment in Virden, Illinois
Now you know the answer to the age-old question, "Does my car's AC use gas?" We hope your vehicle's air conditioning system never fails you, but if it does, we're here to help. At Freedom Chevrolet Chrysler Dodge Jeep Ram, our highly qualified technicians can diagnose any issues with your car's AC and get you back on the road quickly. If you have a specific question about your vehicle, you can even use our easy online form to ask a technician for help. Contact us today for more information. We look forward to servicing your vehicle in Virden, Illinois.
"Dashboard" by Elizabeth is licensed under CC BY 2.0
