![]() ![]() The Compressor literally drives the system. Low pressure refrigerant is routed through the evaporator. ![]() It is the easy evaporation of refrigerant as a result of this drop in pressure which provides cooling. The orifice tube or expansion valve marks the start of the Low Side, where the pressure in the system is dropped from as much as 250 pounds per square inch (psi) (or more) to, for example, 30 psi. The system area “downstream” of the compressor, including the condenser and receiver/drier are on the High Side. There are four basic types of A/C Systems: the basic cycling clutch system the control valve system the clutch cycling orifice tube system (CCOT, also known as an accumulator orifice tube system) and the variable displacement orifice tube system (VDOT).Īll systems cool by the same principle: converting a liquid to a gas (the refrigerant) pulls heat from air passing through the evaporator.Īlthough they are a closed-loop, A/C systems are divided in two sections: High Side and Low Side, referring to the pressure levels at each. In addition, switches and controllers as well as refrigerant and lubricant are indispensable. The basic components of a typical five part A/C system are: the Compressor the Evaporator the Condenser the Expansion Valve or Orifice Tube and the Accumulator or Receiver Drier. This property is why A/C works at all and is at the root of most troubleshooting. Lower the pressure, its temperature will drop. Raise the pressure of the gas, its temperature will rise. Whenever you are thinking about air conditioning systems it is useful to remember some high school physics or chemistry: with gasses, temperature and pressure vary in kind. ![]() The market is also rife with provincial regulations that vary from region to region, but the principles that govern air conditioning systems remain the same which is good because it is a market which can demand much of counterpeople. Nevertheless, even in moderate weather conditions, a vehicle’s air conditioning system can fail and cause the car’s owner to overheat.Ī modern vehicle’s air conditioning system is inseparably connected to the overall climate control and defogging system and, as a result, the air conditioning parts market continues to expand and demand flatten somewhat throughout the year, though summertime peaks are still the norm. The Farmer’s Almanac is promising a scorcher of a summer (so I’ve been told) which seems hard to believe from the late start it seems to be getting in certain parts of the country. ![]()
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