Observe the following conditions prior to the A/C performance test

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.

Provide a vehicle diagnostic system or. Safeguard electrical system integrity by checking the fault memory (no faults in the fault memory).
Provide a thermometer with separate gauge.
Perform the test in a suitable work bay with an ambient temperature between 20 °C and 30 °C.

Re 1:

Connect diagnosis system to vehicle and display evaporator temperature.

Re 2:

Position a thermometer with a separate gauge approx. 5 cm below the roof liner at the height of the B-pillar. Lay gauge outwards out of vehicle interior.

Re 3:

Heat vehicle interior:

"A/C button" is not activated during the heating process
Close all windows and doors.
Set recirculated air mode.
In A/C menu (MMI) in Air distribution index tab: select 100 % footwell for driver and front passenger and 100 % defrosting for driver (this applies here to driver and front passenger)
Maximum temperature setting (28 °C)
Maximum fan speed (adjust 9 pixels from 9 possible on front A/C control panel)
Run engine at approx. 2000 RPM until operating temperature is reached, then idle speed.