6450... A/C performance test (R 134a)

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2011 BMW 323i, 2010 BMW 335xi, and 2010 BMW 335i. However, it is still accessible from the selected car via links, so may be relevant.

Before A/C performance test, some conditions must be met

Provision of a BMW diagnostic system. 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 workshop area with an ambient temperature between 20 °C and 30 °C.

Re 1:

Connect BMW diagnostic 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:

Heating up the passenger compartment:

A/C button is not activated when heating up.
Close all windows and doors.
Set air recirculation function.
Select air distribution mode for footwell and defrosting.
Maximum temperature setting
Maximum blower speed
Run engine at approx. 2000 RPM until operating temperature is reached, then idle speed.

Air-conditioning performance test

Turn on A/C compressor at a vehicle interior temperature of 50 °C.

After 3 to 4 minutes, the evaporator sensor temperature must be = 15 °C.

DRAW OFF AIR CONDITIONING 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.

NOTE: Air conditioning with uncontrolled compressors only:
If necessary, then continue troubleshooting by pressure measurement.