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

Before A/C Efficiency Test, Satisfy Following Conditions  :

1. Provide a MoDiC or DIS. Safeguard electrical system integrity by checking the fault memory (no faults in the fault memory).
2. Provide a thermometer with separate gauge.
3. 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 until operating temperature is reached, then idle speed.

A/C Efficiency Test: 

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

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

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: supplement refrigerant and repeat test. Refer to HEATING AND AIR CONDITIONING - TECHNICAL DATA - COOPER (1.6L) R50/W10 .

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

If necessary, then continue troubleshooting by pressure measurement.