HOW TO OPERATE YOUR CAR AIR CONDITIONER IN THE DESERT
By and large most car and truck air conditioning controls are self explanatory. An exception is certain Swedish automobiles with counter intuitive switches that light up when the air conditioning is turned OFF.
But there are ways to get better performance and comfort than you might otherwise:
In most vehicles, the highest blower speed is very inefficient, particularly when starting out with a hot car. In those case the air is moving so fast across the evaporator coil (in the dashboard) that cools it, that not enough heat can be absorbed. Try using a reduced blower speed by one or two steps.
If your vehicle has sat closed up out in the sun or otherwise absorbed a lot of summer heat it can take a long time to dispel that heat. Often a car sitting in direct sunlight will have a dash vent temperature exceeding 140 degrees F. If you think about that, the air outside is cooler than what is inside your car. Try partially opening your window(s) and setting your controls to allow outside air in, the opposite of “Recirculate” or Max Air” settings. It may take five minutes or more, but this should accelerate getting rid of the most intense heat in the vehicle. Then close your window(s) and change your controls to “Recirculate” or “Max Air”.
About that 140 degree F. temperature in the vehicle; it will have permeated the seats, the carpet, the dash assembly and the headliner. Until that heat has been dissipated the vehicle cabin does not reach its most comfortable potential.