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AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Principal problem Symptom
Possible causes
Abnormal levels of pressure
Low pressure normal and high pressure too high
Under cooling too weak
Aircon circuit diagnosis table
Presence of air in the aircon circuit
Aircon pressostat defective
Evaporator sensor defective
Aircon pressure reducer jammed open
Filtering and drying cartridge saturated or
clogged
Presence of air in the aircon circuit
Filtering and drying cartridge clogged
Low pressure normal and high pression too low
Low pressure too high and high pressure normal
Aircon pressure reducer iced up
Lack of aircon fluid
Excess aircon fluid
Low pressure too low and high pressure normal
Air conditioning operating in back-up mode
Under cooling excessive
NOTE: In all cases, measure the excessive heating (SC) and the blown air temperature.
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