CITROEN 2005 C4-XSARA-XSARA PICASSO BERLINGO Owner's Manual page 446

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.
Under-cooling.
The under-cooling represents the difference between the condensation temperature and the aircon
fluid temperature at the aircon condenser outlet.
The under-cooling gives the quantity of aircon fluid (in the liquid state) in the air conditioning circuit.
Values for under-cooling (SR).
Values «p»
Lack of aircon fluid in the aircon condenser
SR < 2°C
(should be more than 150 grammes)
Lack of aircon fluid in the aircon condenser
2°C < SR <4°C
(should be around 100 to 150 grammes)
4°C < SR < 10°C/12°C Correct quantity
SR > 10°C/12°C
Excess aircon fluid in the aircon condenser
SR > 15°C
Blown air temperature «u».
The blown air temperature should be between 2°C and 10°C.
440
«s»: Over-heating (SC).
«t»: Ambient air temperature.
«u»: Blown air temperature.
«v»: Humidity.
«w»: Temperature T3.
Origins Solutions
Add some
aircon fluid
Remove some
aircon fluid