||In most countries, any person who services an air conditioning system must be separately accredited to comply with local environmental protection legislation, or under close supervision of an accredited person.
|Vehicle heating & ventilation systems
||To improve passenger comfort and safety, fresh air is drawn from outside ducts and directed to the passenger compartment. Incoming air can be heated by passing over a small heating core connected to the engine's cooling system.
|Basic air-conditioning principles
||Heat transfer can take place by one of three methods, conduction, convection and radiation.
||Latent heat is the amount of heat required to be added to a substance or removed from a substance to bring about a change of state.
||The refrigerant removes heat from the vehicle interior and transfers it to the outside air in a continuous cycle of vaporization and condensation.
|Humidity||Reducing the temperature of the air also reduces its humidity. Cold air will not hold as much water vapor as warm air.|