| High-pressure sender -G65- and pressure sender for refrigerant circuit -G805- |
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| -G65- is installed instead of the air conditioning system pressure switch -F129- or the refrigerant pressure and temperature sender -G395-. |
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| On vehicles from a certain version and production date onwards, -G805- replaces -G65-. |
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| One version of the -G65- generates a square-wave signal or data telegram when voltage is applied. This signal changes with the pressure in the system. The other version and -G805- exchange information with the corresponding control unit over the data bus (e.g. over the „LIN bus“) when voltage is applied → Heating, air conditioning; Rep. gr.87 or → Air conditioning; Rep. gr.87 (vehicle-specific Workshop Manual). |
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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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| -G805- transmits only the measured value for the pressure in the refrigerant circuit to the connected control unit. -G395- transmits the measured value for the pressure in the refrigerant circuit and the measured temperature to the connected control unit. Even if only the pressure signal is evaluated for a vehicle, a vehicle in which a -G805- is intended to be installed must not be fitted with a -G395- → Electronic parts catalogue. |
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| The control units downstream (radiator fan control unit, engine control unit, operating and display unit for front air conditioning system -E87- or Climatronic control unit -J255- etc.) use this signal to calculate the pressure in the refrigerant circuit; the control units then actuate the radiator fans, motor and air conditioning system magnetic clutch -N25- accordingly or modify the actuation of the air conditioner compressor regulating valve -N280- → Vehicle diagnostic tester („Self-diagnosis“ or „Guided Fault Finding“, → Heating, air conditioning; Rep. gr.87 or → Air conditioning; Rep. gr.87 (vehicle-specific Workshop Manual). |
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