| Checking pressures on vehicles with expansion valve, receiver and air conditioner compressor regulating valve -N280- (with externally regulated air conditioner compressor) |
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| Connect air conditioner service station → Chapter. |
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| If problems are only encountered at one evaporator on vehicles fitted with two evaporators, check whether the pressures in the refrigerant circuit are OK. Check for cross-sectional restriction or blockage of the line connection between the problematic evaporator and the outgoing line connection at the refrigerant line distribution point. If no fault is found, discharge the refrigerant circuit and re-fill it with the specified quantity of refrigerant. Then check the pressures and the cooling output of the air conditioner again. If the problem persists, renew the expansion valve upstream of the problematic evaporator → Heating, air conditioning; Rep. gr.87 or → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). |
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| Check the pressures in the refrigerant circuit (with the air conditioner service station) with the ignition switched off → Chapter. |
| The pressures with the ignition switched off correspond to the specifications. |
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| Set engine speed to 2000 rpm. |
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| Observe the pressure reading (e.g. pressure gauge) of the air conditioner service station. |
Note | t
| The switching pressures for actuation of the air conditioner compressor regulating valve -N280- and the radiator fans -V7- are vehicle-specific. |
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| Specifications for pressures in refrigerant circuit → Chapter |
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