Air Conditioner Test (R 134A)

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

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