How Does a Car's Air Conditioning Work?

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All across North America, a climate change occurs every year. The cooler spring temperatures give way to warmer weather. In some areas this lasts for two months, and in others it lasts six months or longer. It’s called summer.

With summer comes heat. Heat can make your car unbearable to drive, which is why air conditioning was introduced by Packard in 1929. Beginning in luxury cars and now expanding into almost every vehicle produced, air conditioning has been cooling drivers and passengers for decades.

What Does Air Conditioning Do?

Air conditioning has two main purposes. It cools the air entering the passenger compartment. It also removes the moisture from the air so it feels more comfortable inside the vehicle.

In many makes, air conditioning cycles automatically when the defrost setting is chosen. It pulls the humidity from the windshield to improve your visibility. Often cold air is not required when the defrost setting is selected, which is why it is important to know that air conditioning functions even when the heat is selected on the heater control.

How Does It Work?

Air conditioning systems operate in much the same manner from manufacturer to manufacturer. All makes have some common components:

  • compressor
  • condenser
  • expansion valve or orifice tube
  • receiver/drier or accumulator
  • evaporator

The air conditioning system is pressurized by a gas known as refrigerant. Each vehicle specifies how much refrigerant is used to fill the system, and is usually three or four pounds at most in passenger vehicles.

The compressor does what it's name suggests, it compresses the refrigerant from a gaseous state into a fluid. the fluid is cycled through a refrigerant line. Because it is under high pressure, this is called the high side.

The next procedure occurs in the condenser. The refrigerant flows through a grid similar to a radiator. Air passes through the condenser and removes the heat from the refrigerant.

The refrigerant then moves on next to the expansion valve, or orifice tube. A valve or restriction in the tube reduces the pressure in the line and the refrigerant returns to a gaseous state.

Next, the refrigerant enters the receiver drier, or accumulator. Here, a desiccant in the receiver drier removes moisture that is carried in with the refrigerant in gas form.

After the receiver drier, the cooler, drier refrigerant passes into the evaporator, still in its gaseous form. The evaporator is the only part of the air conditioning system that is actually in the passenger compartment. Air is blown through the evaporator core, and the heat is removed from the air and transferred into the refrigerant, leaving cooler air exiting past the evaporator.

The refrigerant cycles through to the compressor again. The process continues repeatedly.


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Rigoberto

9 years of experience
706 reviews
Rigoberto
9 years of experience
Chevrolet Equinox - Brake Pads Replacement (Rear) - Niles, Illinois
Rigo was great! He got there early, finished the job early, left everything clean. He changed my rear pads and rotors. The original quoted time was 90 minutes, he was done in about 60. He knows what he is doing and I am recommending him to all my friends and coworkers.
Mercedes-Benz C250 - Brake Pads Replacement (Front, Rear) - Chicago, Illinois
Rigo is a maverick hands down. Don’t take your car for work elsewhere. Especially great at Mercedes—this guy knows his profession! I will be using him for everything related to my car going forward.

Arturo

25 years of experience
35 reviews
Arturo
25 years of experience
Kia Forte - Brake Pads Replacement (Front) - San Diego, California
ARTURO is great! very professional , fast, replaced my front brake pads and oil an filter change. everything now works and works well. Brakes have much improved stopping power and engine is smooth and quiet.Arturo is also kind and thoughtful. "Your mechanic" is very fortunate to have Arturo Lopez represent your company. I enthusiastically recommend him and "Your mechanic> as a fine operation Best regards to the Team Peter Marto
Nissan Maxima - Brake Pads Replacement (Front, Rear) - San Diego, California
Arturo was prompt and completed my brake repair, including new rotors in a very efficient manner. I am very pleased with the quality of the work and the parts and will definitely look to have him service our other car in the near future.

Scott

32 years of experience
345 reviews
Scott
32 years of experience
Lexus IS250 - Brake Pads Replacement (Rear) - Denver, Colorado
Always on time, speedy, professional, and pleasant to interact with. The work is always consistent and we'll done. I can't reccomend Scott highly enough!

Michael

10 years of experience
15 reviews
Michael
10 years of experience
Nissan Sentra - Brake Pads Replacement (Front) - Conyers, Georgia
He was promptly on time and got the job done efficiently in a timely manner. I really appreciate the rapid respone on getting the job done! I would most definitely use this service again.

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