In this video we take apart the heating and air condition unit to see what’s inside and how it works!There are four main functions in your car’s heating and air conditioning system, including the air source (recirculate and fresh air), fan speed, temperature and vent mode. All of these happen behind the dashboard in the HVAC unit. These are a subset of the air conditioning system (including compressor, condenser, drier, expansion valve) and the heating circuit (engine, radiator, thermostat and water pump).
The heater A/C box in this video was from a 2006 Volkswagen Jetta. Main components include the recirculating flap and its motor, blower motor, blower motor resistor, air filter, housing, evaporator core, thermostatic expansion valve, heater core, electric heater, temperature control motor, mode selector gears and mechanisms as well as vent valves.
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