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1
POSSIBILE FAILURE FOR THE A/C SYSTEMS

• PROBLEM condenser high pressure
• Fan damaged, condenser clogged
• Too much refrigerant

CONDENSER

• PROBLEM the system does not engage
• Leakage in the system
• Low pressure (2 bar)
• Electrical problem

HELICOIDAL FAN
COMPRESSOR
FILTER

• PROBLEM HPLP
• Failure in the compressor

EXPANSION VALVE
CENTRIFUGAL FAN

• PROBLEM air hot
• Absence of refrigerant
• Iced valve (low P)
• Saturated filter
• Too much oil

EVAPORATOR
INSIDE CAR

• PROBLEM no air outlet
• Iced evaporator
• Fan damaged

2
OPTIMAL PRESSURE RANGE
HIGH PRESSURE
Optimal Range

• The outline of High Pressure of compressor with
  ambient temperature.
• The outline of Low Pressure is quite constant has
  to be considered between 0.5 e 2 bar (15C and
  38C)