64 50 ... Air Conditioner Test (R 134A)

WARNING: This page is about a different car, the 2010 BMW X5, 2009 BMW X5, 2008 BMW X5, and 2007 BMW X5. 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. See 64 50 009 DRAWING OFF, EVACUATING AND FILLING A/C SYSTEM (R 134A) .

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.