CITROEN C4 2004 Handbook page 402

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
E5AP2FBC
Interpretation of the measurements.
«m»: High pressure.
«n»: High temperature.
«p»: Under-cooling (SR).
«q»: Low pressure.
«r»: Low temperature.
Over-heating (SC).
The over-heating represents the difference between the aircon fluid temperature at the evaporator outlet and
the evaporation temperature.
The over-heating gives the quantity of aircon fluid (in the liquid state) in the air conditioning circuit.
Values «s»
2° < SC < 15°C
Correct quantity
SC > 15°C
Lack of aircon fluid in the cooling circuit
SC < 2°C
Excess aircon fluid in the cooling circuit
Blown air temperature «u».
The blown air temperature should be between 2°C and 10°C.
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«s»: Over-heating (SC).
«t»: Ambient air temperature.
«u»: Blown air temperature.
«v»: Humidity.
«w»: Temperature T3.
Values for over-heating (SC)
Origins Solutions
Add aircon fluid
Remove aircon fluid