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Air conditioning stopped cooling / no response to AC button

Q: What are the symptoms of Air conditioning stopped cooling / no response to AC button in Audi Wszystkie modele?

Frost or ice on pipes under the hood. Air conditioning does not turn on

Q: How to fix Air conditioning stopped cooling / no response to AC button in Audi Wszystkie modele?

Strict compliance with workshop procedures: PROHIBITION of starting the engine in a vacuum. Correct operation of the machine's HP and LP valves when filling. If the disc breaks, the entire compressor may be eligible for repair again. RULE: never start the engine until the machine confirms the correct pressure in the system. Procedure: vacuum evacuation -> filling with gas -> then starting the engine.

in Audi Wszystkie modele (2004-2025)

Symptoms

Frost or ice on pipes under the hood
Air conditioning does not turn on

DTC error codes

Mechaniczna awaria compressor after wymianie

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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

Refrigerant specifications for this model are available in the catalog.

Open refrigerant database

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