Performance Test

A performance test shows whether the A/C system is actually working. There may still be faults in the control of the A/C system or the temperature in the cabin, which require' more thorough investigation.


Conditions


Doors and windows Closed
Panel vents All open
Engine speed 1500-2000 rpm

Rear A/C
Doors and windows Closed
Panel vents All open
Engine speed 1500-2000 rpm



Control Settings

Manual A/C ACC
Fan speed 4 Max. fan
Temperature Cold "LO"
Air distribution valve VENT "VENT" manual selection
Recirculation Yes Yes

Rear A/C
Fan speed Max. fan front and rear
Temperature "LO"
Air distribution valve "VENT" manual selection
Recirculation Yes


Readings after 5 minutes


Ambient temperature 20° C 30° C 40° C
R12 system until -91

Air temperature
measured approx. 100 mm inside
the center facia vents 6° - 10° C 6° - 10° C 10° - 12° C

Pressure measured on
suction side of compressor,
Compressor switched ON/OFF 1 - 3 bar 1 - 3 bar 1 - 3 bar

Pressure measured on
pressure side of compressor,
Radiator fan ON/OFF R12 14.5/10.5 bar 14.5/10.5 bar 14.5/10.5 bar
R134a 16.5/12.5 bar 16.5/12.5 bar 16.5/12.5 bar
Radiator fan second stage ON/OFF 22/18 bar

Rear A/C
Air temperature measured
approx. 50 mm inside the
rear facia vent 6° - 12° C 6° - 12° C 10° - 12° C