Automobile air conditioning systems cool the
occupants of a vehicle in hot weather.
Automotive air conditioning is the process by which the air
is cooled and cleaned, the humidity lowered and the air
circulated. The quantity and quality of the air is also
controlled. Under ideal conditions the air-conditioning
system can be expected to accomplish all these tasks at the
The air-conditioning system in modern vehicles is
designed to lower the temperature to therefore assess the
system’s performance. The manifold and hand valves allow
the system to be purged of refrigerant, evacuated of air
and moisture, and recharged with new refrigerant.
Most modern gauge sets use two gauges, but some airconditioning systems that use a pressure control regulator
for the evaporator may require a second low-pressure