When you first get into your hot vehicle, try to drive with the windows open to let out the hot air and let in a fresh breeze. If this fails to lower the temperature in your car, you can put on the air conditioning. The air conditioner will work more efficiently and faster if you open up the windows first. If you need to use the air conditioning in your car, you should keep in mind that your fuel economy will be reduced by 10 to 20 percent.
One of the ways to use your air conditioner is to use it for minimal amounts of times. Keep the windows closed when you are using the air conditioning. Once the car has reached a cooler temperature, you can turn off the air conditioning but it is important to note that you should still keep the windows closed since opening them will only allow in the hot air once again.