Note | t
| The temperature of the components of the refrigerant circuit should be equal to the ambient temperature (if individual components of the refrigerant circuit are warmer or colder, the pressure deviates from the values in the table). |
| t
| At absolute pressure, 0 bar corresponds to an absolute vacuum. The normal ambient pressure (overpressure) corresponds to 1 bar absolute pressure. On the scales of most pressure gauges, 0 bar corresponds to an absolute pressure of one bar (recognizable by the indication -1 bar below 0). |
| t
| On vehicles with high pressure sender -G65-, on which the measured pressure is displayed in the measured value block, the measured pressure should correspond to the values in the table. |
| The measured pressure in the refrigerant circuit is lower than the pressure indicated in the table: |
| Too little refrigerant in the circuit. |
| –
| Detecting leaks on the refrigerant circuit → Chapter. |
| If the pressure relief valve is drained: |
| –
| Check the radiator fan control. |
| –
| Check coolant pipes and refrigerant hoses for cross-sectional constrictions, for too small bending radii. |
| –
| Check coolant pipes and collant hoses for external damage. |
| –
| If no fault is found, clean refrigerant circuit → Chapter. |
| The pressure in the refrigerant circuit corresponds to what is given in the table or is higher: |
| –
| Set air conditioning system to maximum refrigerating capacity → Anchor. |
Note | On vehicles with regulating valve for compressor of air conditioning system -N280-, the control current can be read in the measured value block → Vehicle diagnostic tester |
| If the AC compressor is not driven while the engine is running or the regulating valve is not actuated (compressor specific): |
| –
| The cause, for example, can be determined and eliminated by interrogating the fault memory of the air conditioning system → Vehicle diagnostic tester |
| –
| Test the voltage supply for the air conditioner magnetic coupling -N25- if it is O.K., repair magnetic coupling. |
Note | The regulating valve for compressor of air conditioning system -N280- is actuated by the control and display unit for air conditioner Climatronic -E87- or by the Climatronic control unit -J255- → Vehicle diagnostic tester |
| –
| Continuation of the test depending on the arrangement of the refrigerant circuit → Chapter. |
|
|
|
