AR83.30-D-1209A | Carry out quick test on air conditioning system | 7.1.96 |
MODEL 163 with CODE (580) Air conditioning or Tempmatic for USA
MODELS 901.0 /3 /4, 902.0 /3 /4, 903.0 /3 /4, 904.0 /3 /4 with CODE (H06) Air conditioning
D83.30-0003-09
Shown on models 901, 902, 903, 904
3 Air conditioning system leak detector
1 Temperature measurement device
2 Fluid reservoir inspection glass
Prerequisites for testing | |||
1 | Place vehicle with open windows in the shade | ||
2 | Set heater control valve to "cold" | ||
3 | Set heating and ventilation system to fresh air mode | ||
4 | Fully open lateral nozzles, center nozzles and footwell flaps | ||
5 | Start vehicle engine and allow to idle | ||
Inspecting | |||
6 | Switch air conditioning on | When the air conditioning is switched on, the vehicle engine's idle speed must increase. No idle speed increase | |
Check function of refrigerant compressor RPM sensor in the event of complaint | |||
Replace refrigerant compressor RPM sensor | |||
Models 901-904 | |||
Not in model 163 | |||
7 | Set blower rotary switch to maximum blower setting | ||
8 | Check that refrigerant flows free of bubbles | If the system is filled sufficiently, the refrigerant must flow through the inspection glass (2) free of bubbles. A newly-filled system may initially reveal bubbles. In this case, wait for approx. 10 min. and check inspection glass again. Does not reveal bubble-free flow | |
Check entire air conditioning circuit for leaks using leak detector (3). | |||
Air conditioning system leak detector | |||
9 | Determine air outlet temperature | Switch blower rotary switch to stage "1". Insert sensor of temperature measurement device (1) into the air outlet of the center nozzles. After running for a period of 5 min., the air outlet temperature must not be less than 2 °C and more than 12 °C. After 5 min., at the latest, the refrigerant compressor must also be connected and disconnected. If the refrigerant compressor is disconnected at below 2 °C | |
Check evaporator temperature switch. If the air outlet temperature is not achieved | |||
Check the connection and disconnection of the refrigerant compressor or the refrigerant pressure upstream and downstream of the refrigerant compressor. | |||
10 | Switch air conditioning off and shut vehicle engine off |
Commercially available tools
Workshop equipment
WE58.40-Z-1002-20A | Air conditioning leak detector |