5 Tips to Get the Most Cool From Your Car Air Conditioning

It’s summer and it's hot, which means your car's air-conditioning system is going to get a workout. But there's an art to cooling your car correctly. The engineers at the CR Auto Testing Center have some handy tips to help you cool your car faster while burning less fuel.

1. Don’t Pre-Cool
Your car air conditioning works much better when you're actually driving, because the faster the engine turns, the faster the air compressor runs, which lets the system cool more effectively. Don't waste time and gas by letting your car run before you go.

If the interior is really hot, crank up the fan when you start driving, and open just the rear windows for 10 to 20 seconds. This forces all the hot air out of the cabin. Don’t open the front windows—that only moves the heat out of the front of the car, and it will leave the air in the back of the cabin hot and stagnant.

2. Go Low
Setting to the lowest temp and adjusting the fan makes the car air conditioning more efficient, will dry out the air less, and can actually save some fuel. Why's that? In a typical A/C system, the air is cooled to 38 degrees. If you set the temp higher, you are actually forcing the system to re-heat your air, which takes more effort, burning more fuel.

3. Don't Recirculate
If you have passengers in the back seat, turn off the recirculation mode. This takes air from the front of the cabin and pulls it back through the system, so even though everyone up front stays cool, the air in the back can get stale and hot.

4. Turn Off Stop/Start
If you’ve got a newer car that has an auto start/stop system, turn it off. This feature saves fuel, but it can also keep the car air conditioning compressor from running when it shuts the engine off. In very hot weather, you can begin to notice the lack of cool air very quickly, especially if you're stuck at a lengthy stoplight, or in stop-and-go traffic that's barely moving.

5. Make Sure Your Filter's Clean
Next time you get the chance, check your cabin air filter to make sure it’s clean. A dirty filter prevents optimal airflow. In newer cars, these filters are relatively easy to check on; if you see a lot of dirt accumulated on it, it's time to change it. You can save money if you can replace the filter yourself—in many modern cars the filter is accessible behind the glove compartment. But that's not always the case. In some vehicles, such as the first-generation Honda Pilot, the entire dash must be removed in order to get at the cabin air filter, and that's not a job for the faint of heart.



Source: Consumer Reports