Suction from the compressor pulls the high
pressure/temperature liquid R134a through
small variable orifice of the TX valve and into
the low-pressure side of the A/C system.
The R134a is now under low
pressure/temperature vapor where heat from
the cabin being blown over the evaporator
coil surface is absorbed into the colder low
pressure refrigerant The R134a is then pulled
through the evaporator and into the
compressor. The A/C cycle begins again as
the R134a vapor is compressed and
discharged under pressure.