64 50... Air conditioner test (R 134a)

WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

Before A/C efficiency test, satisfy following conditions:

Provide a MoDiC or DIS. 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 MoDiC or DIS to car 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 vehicle interior:

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

A/C efficiency test:

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

After 3-4 minutes, the evaporator sensor temperature must be ≤ 15°C.

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. See HEATING AND AIR CONDITIONING - TECHNICAL DATA

If fill quantity is correct, continue troubleshooting by pressure measurement.

NOTE: A/C systems with uncontrolled compressors only:
If necessary, then continue troubleshooting by pressure measurement.