Component Tests and General Diagnostics

TEST CONDITIONS
- Park car where it is not subjected to sunshine.
- Clean the condenser.
- Close sun roof doors and windows.
- Turn temperature control switch to "max. cold" final position (blue dot on scale).
- Slide defrost lever and footwell lever against the right stops (opened).
- Switch on blower to speed 4.
- Open all dashboard air outlets.
- Measure ambient temperature (outside of car).





- Connect service tester to the air conditioner compressor service ports.
(1) High pressure
(2) Low pressure

TESTING
1. Insert a thermometer in the center nozzle outlet.
2. Start and run engine at speed of 2,000 rpm.
3. Switch on air conditioner.





4. Read the values for temperature on the center nozzle as well as high and low pressure with the compressor running after two minutes.
A - Center nozzle temperature
B - Ambient temperature





Low Pressure Gauge




High Pressure Gauge

NOTE: Gauge values must be located in the shaded area of the applicable chart.

Checks if specified values are not reached.
1. The temperature mixing flaps must be completely closed (warm air necks or sills must not be warm). Adjust if necessary.
2. The condenser fan must switch to second speed with a refrigerant high pressure of approx. 19 bar (270 psi).