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A/C works intermittently or cuts out during driving

Q: How to fix A/C works intermittently or cuts out during driving in Volkswagen EuroVan (T4)?

Replacement of the harness or professional reconstruction on compression connectors (no soldering!). In T4 of these years, if the compressor is spinning, pull the cables at the plug - often the insulation is left in the fingers and the cables are touching each other. The VW factory prohibits soldering these cables - use crimp connectors.

in Volkswagen EuroVan (T4) (2000-2004)

Symptoms

Air conditioning works intermittently

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

Refrigerant specifications for this model are available in the catalog.

Open refrigerant database

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