Vehicle cooling and warming systems, also known as air conditioners, are desirable technologies in vehicles. They provide a comfortable climate for the driver and passengers by keeping the cabin cool in warm climates and providing warmth during cold weather. In addition to creating a comfortable temperature, AC systems also help to eliminate fog on the windshield and windows during cold weather by defogging or demisting them. The compressor is the heart of the entire AC system and a well-functioning compressor is crucial for optimal performance of the air conditioning system. Otherwise, less cold air is blown into the vehicle's interior.
To provide the cabin with cool, comfortable air, a refrigerant, typically Freon, circulates through the AC system, absorbing the heat from inside the vehicle. The compressor is the power unit that compresses the refrigerant to activate its heat transfer and temperature-changing abilities before it enters the condenser, where it converts from gas to liquid. This component makes the entire AC process possible.
The compressor is comprised of a pulley and V-belt that are attached to and driven by the engine block. When the AC is switched on, an electromagnetic clutch sets the belt to drive the compressor using power from the engine. As the compressor runs, it takes in the refrigerant through the evaporator, creating low pressure and causing the refrigerant to evaporate at a low temperature. The compressor then pressurizes the resulting cold vapor by compressing it, which warms and transfers the refrigerant into the condenser, where it is liquefied and heat is removed from the refrigerant.
The liquefied refrigerant then moves to the evaporator, cooling and absorbing heat from the vehicle's interior. From there, the refrigerant returns to a gaseous state and moves into the evaporator, where it is drawn in again by the compressor to repeat the process. A failing compressor can make strange noises, leak fluids, and cause the AC system to operate unevenly.
The condenser converts the heated gas into a cold fluid. It is located in front of the radiator and is responsible for radiating the humid air drawn into the compressor, after which it depresses, cools, and liquefies the air.
The receiver dryer purifies the atmospheric air that enters the AC system. Found on vehicles equipped with thermal expansion valves, it filters all particles, moisture, and water from the gas before transferring it to the air compressor. This process protects the compressor from dirt and elements, preserving the AC system's operability. Without it, water would enter the compressor and create acidic contaminants when it comes into contact with the refrigerant, causing the AC system to shut down immediately. A malfunctioning receiver dryer also leads to less cold air and failure of the defrosting system.
The accumulator replaces the receiver dryer on vehicles equipped with orifice tubes instead of thermal expansion valves. It performs the same function as the drier, trapping all dirt and particles and removing moisture from the air entering the AC system. It also protects the compressor from drawing in excess refrigerant by restricting the refrigerant level in the evaporator.
The expansion valve is the divider between the condenser and evaporator in the AC system. In some vehicles, however, the valve is replaced by an orifice tube. The valve or tube regulates the refrigerant entering the evaporator by metering the heat and pressure levels from the condenser. The expansion valve or orifice tube can become clogged with debris and other particles, resulting in insufficient cold
The evaporator is a component that cools and absorbs moisture from the air. It is located behind the dashboard and acts as the final stage in the cooling process before the air enters the cabin. The cooling process occurs as air blows through the refrigerant in the evaporator, which simultaneously removes heat from the cabin. If the air conditioning (AC) is not cold enough, it may be due to a worn-out evaporator.
An electromagnetic clutch activates the compressor whenever the AC system is turned on, allowing it to pressurize the refrigerant before it is transferred to the condenser and then to the evaporator. The clutch also protects the evaporator from completely freezing by regulating temperatures within the evaporator through the cycling clutch switch. If there is a freeze-up or reduced coldness in the evaporator, it may indicate a failing clutch switch.
The compressor is the driving force behind the vehicle's AC system. Without it, the AC will only provide normal outside air at atmospheric temperature into the vehicle's interior. The compressor pressurizes the refrigerant, which then activates its temperature-changing abilities, providing a desired climate inside the vehicle. Other components, such as the refrigerant, the serpentine belt that drives the compressor, and other parts that make up the AC system, are also necessary for the AC to function correctly.
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