What are the symptoms of Air conditioning stopped cooling / no response to AC button in Audi S6 (4G)?

Vibrations or humming after turning on A/C

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Air conditioning stopped cooling / no response to AC button

Q: How to fix Air conditioning stopped cooling / no response to AC button in Audi S6 (4G)?

Replacing the specific low pressure hose (connecting the compressor with the coaxial pipe) with a modernized part with OEM number 4G0260707X, having a built-in pressure vibration damper.

in Audi S6 (4G) (2014-2018)

Symptoms

Vibrations or humming after turning on A/C

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Technical diagnosis (Premium)

Recognized technical fault:

Auxiliary controller voltage instability detected

Technical analysis

Detailed analysis of HVAC controller operation parameters, CAN bus data readings, and diagnostic signal waveforms. Purchase PRO access or log in to read the full fault analysis.

Confirmed solution

Complete step-by-step repair procedure including module non-volatile memory reset, sensor calibration, and correct wiring routing. Unlock the full report to see the instruction.

Parts needed

Filters ferrite anti-interference / noise suppressor
Auxiliary starting battery (depending on cell status)

Workshop hacks

Important workshop tips for mechanics regarding bypasses without expensive control module replacement and manufacturer software service bulletins.

TSB / TPI service bulletins

TSB-24-HVAC-01TPI-2068943/2

A/C Technical Specifications

Standard

Refrigerant: R134a Amount (g): 530g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 130ml

See full specification

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