What are the symptoms of Air conditioning stopped cooling / no response to AC button in Audi S5 8T?

No cold air from vents. Problem visible at standstill or in traffic

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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 S5 8T?

Replacement of the G395 high pressure sensor with an updated revision (e.g. with index D) along with a new O-ring, as well as cleaning and possible repair of the corroded cable plug.

in Audi S5 8T (2008-2014)

Symptoms

No cold air from vents
Problem visible at standstill or in traffic

DTC error codes

00256

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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

kompresor Zexel/Denso

Refrigerant: R134a Amount (g): 600g Oil: PAG PAG 46 lub PAO 68 Oil (ml): 150ml

See full specification

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