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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 Polo Sedan?

Replacing damaged aluminum cables and adding rubber spacers. Pushing the drain pipe. When checking for leaks in Polo Sedan, immediately look at the places where the pipes meet the body reinforcements - this is a factory assembly error.

in Volkswagen Polo Sedan (2010-2018)

Symptoms

Air conditioning stopped cooling / no response to AC button

DTC error codes

Low pressure

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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

(AE1) 1.0 MPI

Refrigerant: R1234yf Amount (g): 400g Oil: PAG ISO 46 YF Oil (ml): b.d.ml

(AE1) 1.0 TGI / TSI / 1.5 TSI

Refrigerant: R1234yf Amount (g): 430g Oil: PAG ISO 46 YF Oil (ml): b.d.ml

VI - (AW)

Refrigerant: R1234yf Amount (g): 400-450g Oil: PAG YF ISO 46 Oil (ml): 100 - 120ml

See full specification

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