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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 Volkswagen ID.4?

Performing an update of the main controller software (ME 3.5 system patch) and re-calibration and adaptation of the OBD compressor from the diagnostic software level.

in Volkswagen ID.4 (2021-2021)

Symptoms

No cold air from vents

DTC error codes

U032A00

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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

E21 (Wersja standardowa R1234yf)

Refrigerant: R1234yf Amount (g): 460g Oil: POE (nieprzewodzący) Oil (ml): 120ml

E21 (Opcja pompa ciepła R744)

Refrigerant: R744 Amount (g): 420g Oil: PAG (specjalny do CO2) Oil (ml): 200ml

Bez Pompy Ciepła (Standard)

Refrigerant: R1234yf Amount (g): 460g Oil: PAO 68 AA1 Oil (ml): 120ml

See full specification

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Air conditioning stopped cooling / no response to AC button

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in ID.4

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