How Air Conditioning Works

A vehicle’s air conditioning system does not create cold air, as some folks think. It actually takes the heat and moisture out of the air that is already in your car, leaving behind cooler air. Having a good understanding of how the components work can help to explain the process of air conditioning. 

Get familiarized with the components of a Car Air Conditioning System.

1. Compressor.

Many consider the compressor as the heart of the air conditioning system of the car. As the name suggests, it "compresses" the refrigerant so that it turns from a gaseous state into a liquid state. The compressor connects to the crankshaft via a drive belt. As such, it draws its power from the engine.

​Whenever you turn on the car AC system, the compressor pumps gaseous or vaporized refrigerate to the condenser. 

2. Condenser.

Condensation results from the rapid cooling of hot or warm air. The water vapour or moisture in hot air condenses to form a liquid state. This is what the condenser does. It is one of the most recognizable parts of the modern automotive AC system because it is very easy to check.  This looks a lot like the radiator. It is also positioned right in from of the radiator. As such, if you're wondering why you have "two" radiators, the one in front is the condenser.

​This devices turns or "condenses" the high-pressure, high-temperature, vaporized refrigerant coming from the compressor. The air that flows through the condenser removes the heat in the high-pressure refrigerant, cooling it down.

WE TAKE PRIDE IN OFFERING PERSONAL SERVICE!

3. Evaporator. 

Among all the components of the modern vehicle AC system, the evaporator is the only one that is located inside the passenger compartment. The rest of the components are in the engine bay. The evaporator looks like a very small radiator with fins and tubes. Cold air from the cabin circulates through the ducts, it is blown past the evaporator core and the heat is released. What comes out of the AC vents is cold and dry air.

4. Receiver.

This component prepares the refrigerant for entry into the evaporator. It serves as a reservoir for the refrigerant while also removing any moisture that may be present in the refrigerant. It is important that built-in desiccants remove moisture from the refrigerant. If not, ice crystals can form and lead to blockage and mechanical damage.

5. Expansion Valve.

The thermal expansion valve is the boundary between the high-pressure side of the system (including the compressor, condenser and receiver) and the low-pressure side of the system. As the name implies, the expansion valve allows the expansion of the high-pressure liquid refrigerant coming from the receiver-drier. Because of the expansion, there  is a reduction in pressure. 

6. Refrigerant.

While not a "component" of an automotive air conditioning system, the refrigerant is the lifeline of the system. Without it, heat will not be able to move out from the system and bring cooling comfort to everyone in the passenger compartment. At low pressures and temperatures, the refrigerant takes on a gaseous form. At high temperatures and pressures, the refrigerant is liquid. 

OUR TECHNICIANS ONLY RECOMMEND MAINTENANCE AND REPAIRS TO KEEP YOU AND YOUR CAR SAFE.

The Process of Cooling the Air in an AC System

• The compressor, compresses or pressurizes the refrigerant, turning it into a liquid form from its gaseous state. 

• The pressurized liquid refrigerant circulates through the series of tubes located in the condenser. This allows free air coming from the outside of the vehicle to come in contact with the liquid refrigerant. Because the condenser contains a higher-temperature liquid, there is a temperature gradient between the liquid and the fresh air. What happens is that heat moves from the liquid and into the air. 

​

• The refrigerant moves into the accumulator or receiver drier. A desiccant removes moisture that may be present in the refrigerant. This leads to the creation of a cooler refrigerant while also maintaining the integrity of the system.

​

• The cool refrigerant liquid flows into the orifice tube or expansion valve. It reduces fluid pressure, allowing it to move to the evaporator a lot easier. 

​

• The low-pressure liquid refrigerant moves through the evaporator. The air coming from the passenger compartment gets drawn into the evaporator and blasted through the evaporator core. Because the refrigerant is cooler, heat moves from the air and into the refrigerant. What happens now is that the air exiting the evaporator is cold air. Fans help blow the cold air through the vents and allow the cooling cabin. This process also reduces moisture in the evaporator's air-side. This allows for the creation of drier air in the passenger cabin. At the same time, the system collects and drains the condensate. Because the liquid refrigerant in the system is now "hotter", it turns into its gaseous state again. ​

​

• The now-hot, low-pressure gaseous refrigerant circulates back to the compressor, ready to begin a new cycle. 

Resource: auto.howstuffworks.com/automotive-air-conditioning.htm

Bring Your Car to NTW for Maintenance

Specializing in tires, custom wheels, suspension, wheel alignment, brakes, air conditioning service and repair. At National Tire Wholesale, we take pride in offering personal service and excellent quality products at a fair price!

Make sure to call us ahead to book your appointment  604.294.3788. ​

At NTW, we are actively following the guidance and safety recommendations of the Public Health Agency of Canada. Therefore we are taking precautions when handling your car for everyone's wellbeing.

Bring your car to National Tire Wholesale. Our technicians only recommend maintenance and repairs to keep you and your car safe.

BOOK YOUR APPOINTMENT