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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 TT (8N)?

Locating the oxidized section of the cable right next to the compressor, cutting out the damaged section, carefully soldering a new section with heat shrink protection. No compressor replacement required. DIAGNOSTIC TEST: Connect a 12V bulb as a test load between the +12V wire and ground. If the bulb goes out when you try to turn on the AC = rotten wires, not the compressor. Repair: PLN 20 for the cable instead of PLN 1,500 for the compressor.

in Audi TT (8N) (1998-2006)

Symptoms

Air conditioning stopped cooling / no response to AC button

DTC error codes

Brak

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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

(FV) kompresor Denso/Delphi/MAHLE

Refrigerant: R134a Amount (g): 500g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 110ml

(FV) kompresor Sanden

Refrigerant: R134a Amount (g): 500g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 80ml

(8J) kompresor Denso 6SEU14

Refrigerant: R134a Amount (g): 525g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 80 – 100ml

See full specification

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