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

WARNING: This page is about a different car, the 2005 BMW 545i and 2004 BMW 545i. 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 roofliner 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.

A/C Efficiency Test:

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

After 2-3 minutes, evaporator sensor temperature must be 10° C.

Draw off A/C system if this temperature is not reached. Measure amount of refrigerant drawn off. Refer to 64 50 009 DRAWING OFF, EVACUATING AND FILLING A/C SYSTEM (R 134A)

If drawn-off quantity does not correspond to specified fill quantity: replenish refrigerant.

If refrigerant quantity is correct fill A/C system.

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