A/C Pressure/Temperature Sensor
There are different versions of this sensor with different functions and with different names. For exact name, allocation and notes doe the respective function. Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (vehicle-specific repair information).
There is a risk of freezing.
Refrigerant may leak out if refrigerant circuit is not discharged.
There are different versions of this sensor (sensor for a connection to the refrigerant circuit with or without the valves). Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (vehicle-specific repair information).
- Before loosening the threaded connection of the sensor check the version. Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a .
- On a sensor for the connection on the refrigerant circuit without a valve. The refrigerant must be extracted before loosening the threaded connection. If sensor is not removed within 10 minutes after extraction, pressure may build up in refrigerant circuit by renewed evaporation. Extract the refrigerant again.
Sensor for a Connection with the Valve on the Refrigerant Circuit
There are different versions of this sensor with different functions and with different names. The following illustrated A/C Pressure/Temperature Sensor -G395- is for example installed on an Audi A4, Audi Q5, and Audi Q5 hybrid. Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a .
There are various designations, depending on the function and the vehicle. Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a .
Possible names for this sensor
- A/C Pressure/Temperature Sensor -G395- (for example on Audi Q5 hybrid)
- High Pressure Sensor -G65- (for example on Audi A4)
- Refrigerant Circuit Pressure Sensor -G805- (for example on Audi A3 e-tron)
The Refrigerant Circuit Pressure Sensor -G805- is installed instead of for example the High Pressure Sensor -G65- or the A/C Pressure/Temperature Sensor -G395-. Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a .
- The A/C Pressure/Temperature Sensor -G395-, the Refrigerant Circuit Pressure Sensor -G805- and the High Pressure Sensor -G65- are available in different versions. Currently the sensor's only exterior difference is the parts number. Therefore, make sure that the part numbers are correctly allocated when replacing them (part number from the parts information). Reason: These sensors produce different signals that can only be evaluated by the respective control modules using the Vehicle Diagnostic Tester (function "OBD" or "Guided Fault Finding" for the A/C system). Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (vehicle-specific repair information).
- When voltage is applied, the A/C Pressure/Temperature Sensor -G395- (and the Refrigerant Circuit Pressure Sensor -G805- exchange information via the Data Bus (for example via the "LIN-Bus") with the corresponding control module. The relevant control module uses this information to calculate the pressure (and temperature) in the refrigerant circuit and any faults detected are signaled to the control module.
- The A/C Pressure/Temperature Sensor -G395- transmits the measured value for the refrigerant circuit pressure and the measured temperature to the connected control module. The Refrigerant Circuit Pressure Sensor -G805- only transmits the measured value for the refrigerant circuit pressure to the connected control module. Even if only the pressure signal is evaluated on most vehicles, no Refrigerant Circuit Pressure Sensor -G805- is or will be installed in a vehicle in which a A/C Pressure/Temperature Sensor -G395- is designed. Refer to the parts information.
- The temperature measured by the A/C Pressure/Temperature Sensor -G395- differs from the actual refrigerant temperature in the refrigerant circuit because of the A/C Pressure/Temperature Sensor -G395- design and its component location. Because of this, it is not currently evaluated and is not used to regulate the A/C system. Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (vehicle-specific repair information).
- This information is used for example by the Climatronic Control Module -J255- control head or the Vehicle Electrical System Control Module -J519- to calculate the pressure in the refrigerant circuit and to actuate the downstream control modules (radiator fan control module, Engine Control Module etc.) via the Data Bus system. These control modules then actuate, for example, the A/C Clutch -N25-, the radiator fan and the motor. Use the Vehicle Diagnostic Tester (function "OBD" or "Guided Fault Finding" and, REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (vehicle-specific repair information).
Sensor For A Connection Without The Valve On The Refrigerant Circuit
There are different versions of this sensor with different functions and with different names. The following illustrated A/C Pressure/Temperature Sensor -G395- is for example installed on an Audi Q7 e-tron. Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a .
There are various designations, depending on the function and the vehicle. Refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a .
Possible names for this sensor
- A/C Pressure/Temperature Sensor -G395- (for example on Audi Q7 e-tron)
- A/C Pressure/Temperature Sensor 2 -G826- (for example on Audi Q7 e-tron)
- A/C Pressure/Temperature Sensor 3 -G827- (for example on Audi Q7 e-tron)
There are different versions of this sensor -A-, currently the sensor's only exterior difference is the part number or if the part number is the same the imprinted designation -B-. For this reason pay attention to the correct allocation (part number and designation). Refer to the parts information and REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (vehicle-specific repair information).
This sensor exchanges the information with the respective control module via the Data Bus (for example via the "LIN Bus") when creating tension. The relevant control module uses this information to calculate the pressure (and temperature) in the refrigerant circuit and any faults detected are signaled to the control module. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
With this information the respective control module calculates the refrigerant circuit pressure and activates the downstream control module or components (radiator fan control module, pumps, valves etc.) via the Data Bus according to the specifications. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function and refer to REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (vehicle-specific repair information).