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

Before A/C efficiency test, satisfy following conditions:

1. Provide a MoDiC or DIS.
2. Provide a thermometer with separate gauge.
3. Compressor load (intake air temperature of approx. 50°C)

Re 1:

1. Connect MoDiC or DIS to car and display evaporator temperature.

Re 2:

1. 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:

1. 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°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.

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

If refrigerant quantity is correct fill A/C system.