A4 Quattro Sedan L4-1.8L Turbo (AEB) (1998)
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Evaporator Core: Description and Operation
Liquid refrigerant entering the evaporator absorbs heat from air passing through the evaporator fins and cools the air. As the refrigerant absorbs heat it
turns to vapor and then is suctioned by the compressor.
NOTE: Illustration shows the evaporator from an Audi 90 model.
A/C refrigerant low pressure switch -F73-
Function
Switches A/C Clutch -N25- OFF if system suction pressure is too low (low refrigerant charge). This switch protects the compressor if the refrigerant
system is empty.
