27/01/2025
Last but not least, let’s talk a bit about one of the main components of the car's air conditioning system:
EVAPORATORS
The function of the air conditioning evaporator is to act as a heat exchanger where the heat is removed from the inside of the vehicle cabin & to dehumidify the cabin air. As stated previously, liquid refrigerant enters the evaporator coil and begins to turn into a low-pressure gas. As this liquid/gas mix passes through the evaporator coil, heat moves from the warm air blowing across the evaporator fins into the cooler refrigerant. This has now created a transfer of heat from the blower fan air over the evaporator to the refrigerant. This cool air is then ducted into the cabin via the blower fan.
The blower fans function is the create a steady flow of air over the evaporator core, without this air flow there would be no heat exchange. The fan speed is controllable according to the desired cabin temperature.
As warmer air blows across the evaporator fins, moisture contained in the air (humidity) will condense on the cool evaporator fins. Condensed moisture then runs off through the drain tubes located at the underside of the evaporator case. In most vehicles the evaporator is usually located inside the passenger compartment, quite deeply buried in or under the instrument panel. Some vehicles, usually vans or SUV's have two evaporators, one under the dash and the other located in or towarc the rear of the vehicle.
The pollen filter (also known as cabin air filter) is a feature on most modern vehicles It cleans the air that comes into the interior of the vehicle and filters out pollen, dus and other airborne material from settling on the evaporator core. Over time the polle filter can become clogged with dust, leaves, twigs and residue from exhaust fume and requires replacement periodically, around 2 years depending on the operatin environment.
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