Air-conditioning efficiency measurement
WARNING: This page is about a different car, the 2013 BMW Z4, 2012 BMW Z4, 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.
Turn on A/C compressor via "A/C button" at a vehicle interior temperature of 50 °C.
Vehicles with MAX AC button ("MAX"):
- Activation of MAX AC (= maximum chilling capacity)
Vehicles without MAX AC button ("MAX"):
- Set maximum chilling capacity by means of following steps:
- Temperature setting = 16 °C
- Fan setting 9 pixels from 9 possible
- Stratification maximum cold (4 blue bars)
Evaporator sensor temperature must be ≤ 15 °C after 3-4 minutes at approx. 2000 RPM.
DRAW OFF A/C SYSTEM if this temperature is not reached. Measure amount of refrigerant drawn off.
If drawn-off quantity does not correspond to SPECIFIED FILL QUANTITY : supplement refrigerant and repeat test.
If fill quantity is correct, continue troubleshooting by pressure measurement.