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

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Before A/C efficiency test, satisfy following conditions:

Provide a MoDiC or DIS.
Provide a thermometer with separate gauge.
Compressor load (intake air temperature of approx. 50°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° Celsius.

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

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

NOTE: A/C systems with uncontrolled compressors only:

If necessary, then continue troubleshooting by pressure measurement.