| The refrigerant pressure and temperature sender -G395- is installed instead of the high-pressure sender -G65- or high-pressure sender for refrigerant circuit -G805-. |
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| There are different versions of the refrigerant pressure and temperature sender -G395-, the pressure sender for refrigerant circuit -G805- and the high-pressure sender -G65-; depending on the version, they can currently only be distinguished by the part number. Therefore pay attention to the correct assignment when renewing the components (part number → Electronic Parts Catalogue). Reason: These two senders emit different signals, and the relevant control units can only evaluate the signal to which they have been matched → vehicle diagnostic tester („Self-diagnosis“ or „Guided Fault Finding“ mode of air conditioner), → Heating, air conditioning; Rep. gr.87 or → Air conditioning; Rep. gr.87 (vehicle-specific Workshop Manual). |
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| When voltage is applied, the refrigerant pressure and temperature sender -G395- (and the pressure sender for refrigerant circuit -G805-) exchange information with the corresponding control unit via the data bus (e.g. „LIN bus“). The relevant control unit uses this information to calculate the pressure and temperature in the refrigerant circuit and any faults detected are signalled to the control unit. |
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| -G395- transmits the measured value for the pressure in the refrigerant circuit and the measured temperature to the connected control unit. -G805- transmits only the measured value for the pressure in the refrigerant circuit to the connected control unit. Even if only the pressure signal is evaluated on most vehicles, a vehicle in which a -G395- is intended to be installed must not be fitted with a -G805- → Electronic parts catalogue. |
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| The temperature measured by the refrigerant pressure and temperature sender -G395- differs on account of the design of -G395- and the fitting location from the actual temperature of the refrigerant in the refrigerant circuit. It is therefore not evaluated at present by all control units and used for air conditioner control → Heating, air conditioning; Rep. gr.87 or → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). |
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| This information is used, for example, by the operating and display unit (Climatronic control unit -J255-) or the onboard supply control unit -J519- to calculate the pressure in the refrigerant circuit and to actuate the control units downstream (radiator fan control unit, engine control unit etc.) by way of the data bus. These control units then actuate e.g. the air conditioning system magnetic clutch -N25-, the radiator fans and the motor accordingly → Vehicle diagnostic tester („Self-diagnosis“ or „Guided Fault Finding“ mode and → Heating, air conditioning; Rep. gr.87 or → Air conditioning; Rep. gr.87 (vehicle-specific Workshop Manual). |
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