Observe the following conditions prior to the A/C performance test
WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.
- Connect BMW diagnosis system. Check of the fault memory (no faults in the fault memory).
- Attach a thermometer with separate display device to the head restraint and route the display device wiring out of the passenger compartment outward.
- Perform the test in a suitable workshop area with an ambient temperature above 18° C.
- Vehicle temperature should be approximately the same as the ambient temperature in the workshop.
- Engine must be at operating temperature.