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

WARNING: This page is about a different variant/trim than selected.

Observe the following conditions prior to the A/C performance test:

Connect diagnosis system. Check of the fault memory (no faults in the fault memory).
Attach a thermometer with separate display element to the head restraint. Lay display element outwards out of passenger compartment.
Perform the test in a suitable workshop area with an ambient temperature above 18° C.
Vehicle temperature should be approximately the same as the ambient temperature in the workshop.
Engine must be at operating temperature (does not apply for electric vehicles).

Heat passenger compartment:

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.
On vehicles with CID: In A/C menu (CID) in Air distribution index tab: select 100 % footwell for driver and front passenger and 100 % defrosting for driver (this applies here to driver and front passenger)
Maximum temperature setting.
Maximum fan stage.
Start engine (does not apply for electric vehicles)

Cool down passenger compartment:

Switch on air conditioning compressor with "A/C button" at a vehicle interior temperature of 45 °C (measured at the head restraint).

On vehicles with MAX-AC button:

- Activation of MAX-AC (= maximum cooling power)

On vehicles without MAX-AC button:

- Set maximum cooling power by means of following steps:

- Setting minimum temperature

- Blower setting maximum

- Stratification maximum cold (4 blue bars)

- Only ventilation open

- Close remaining flaps (air outlet only from center fresh air grille, left and right)

After 5 minutes measure both ventilation temperatures with a thermometer at the same time (fresh air grille center, left and right). The measured temperature must be = 16 °C and the difference between right and left may not be greater than 2 °C.

If one or both temperature specifications is not reached drain off heating and air conditioning system. Measure amount of refrigerant drawn off.

If drawn-off quantity does not correspond to specified fill quantity: supplement refrigerant and repeat test. See HEATING AND AIR CONDITIONING - TECHNICAL DATA -- CLUBMAN .

If capacity is correct, continue troubleshooting by pressure measurement.

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.

If drawn-off quantity does not correspond to specified fill quantity : supplement refrigerant and repeat test.

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

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