TSB : Electrically-Driven A/C Compressor, Removing And Installing At Bracket (AUDI A6 Hybrid): Notes

Details

NOTE: On the Audi A6 e-tron, the A/C compressor cannot be detached from the bracket and pivoted away, therefore it must always be removed. Refer to ELECTRICALLY-DRIVEN A/C COMPRESSOR, REMOVING AND INSTALLING (AUDI A6 E-TRON) . For this model line, only vehicles with a high-voltage system were or are currently being manufactured that had or are having the refrigerant circuit charged with refrigerant R134a. Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE VEHICLES SAFETY PRECAUTIONS . WARNING: Risk of unintended engine start The ignition must be turned off and the ignition key must remain outside of the vehicle when working on vehicles with a high voltage system. WARNING: Handling high voltage cables: Do not stand on or place tools on high voltage cables and their components as it may damage the cable insulation. Never bend or kink high voltage cables forcefully as it may damage the cable insulation. The round high voltage connectors are color coded with an external color ring and are mechanically coded using the guide- or code tabs. Always make certain that the coding matches when connecting the round connector in order to avoid any mechanical damage the high voltage connector. CAUTION: There is a risk of electrocution from damaged high voltage components. Observe the following when working around high voltage components and high voltage wires: Never work around high voltage components and cables with cutting, deformed, or sharp edged tools, or heat sources such as welding or soldering tools, heated air, and thermal glue. Inspect the high voltage components visually before beginning. Perform a visual inspection of the Electric Drive Power and Control Electronics -JX1-, the Electro-Drive Drive Motor -V141-, the Electrical A/C Compressor -V470- and the high voltage lines when working in the engine compartment. Perform a visual inspection of the high voltage lines and covers when working on the underbody. Perform a visual inspection of the high voltage lines and the Electrobox with the High Voltage System Maintenance Connector -TW- when working in the luggage compartment. Perform a visual inspection on all of the potential equalization cables. Observe the following items when performing the visual inspection: The components do not display any signs of external damage. The high voltage cable insulation and the potential equalization cables are not damaged. The high voltage cables do not display any abnormal deformations. Every high voltage component is marked with a red warning label. NOTE: With A/C Compressor Control Module -J842- and Electrical A/C Compressor -V470- The electric motor for the A/C compressor is powered with voltage from the Electric Drive Power and Control Electronics -JX1-. The A/C Compressor Control Module -J842- integrated in the A/C compressor controls the rotation and thereby the output for the A/C compressor (Electrical A/C Compressor -V470-) corresponding with the Data Bus receiving requirements. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" Function for the A/C System and the Battery Control. There is no A/C Compressor Regulator Valve -N280- installed in the electrically driven A/C compressor. The power output is regulated externally by the A/C compressor speed sensor. Refer to the Appropriate Wiring Diagram and Vehicle Diagnostic Tester in the "Guided Fault Finding" function for the A/C System and the Battery Controls. The electrically powered A/C compressor functions according to the principle of a spiral charger (similar to a G-charger). The A/C Compressor Control Module -J842- and the Electrical A/C Compressor -V470- are components and are currently not able to be separated. Disable the high voltage system to perform the necessary work on the high voltage system for the following procedure. Refer to HIGH VOLTAGE VEHICLES SAFETY PRECAUTIONS . NOTE: It is possible to remove and re-install the A/C compressor at the bracket on vehicles with a 4-cylinder engine without having to open the refrigerant lines. Do not discharge the refrigerant circuit to remove the bracket, do not remove refrigerant hoses and lines from A/C compressor. Do not unfasten refrigerant lines and corresponding clamps. The high voltage system line remains connected to the A/C compressor. Do not release the high voltage system connector from the A/C compressor. After removing the A/C compressor, tie it to the vehicle with wire. Do not let is hang by the refrigerant lines. Different A/C compressors may be installed depending on engine and country variant. Refer to the Parts information.