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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 A3 e-tron?

Irregular A/C operation. No blowing from vents. Air conditioning does not turn on

Q: How to fix Air conditioning stopped cooling / no response to AC button in Audi A3 e-tron?

Replacement of the damaged 'Chiller' exchanger, triple vacancy of the freon system and refilling/bleeding the water system of the HV battery. If a hybrid car (PHEV or EV) spits water out of the tank on the hood, and at the same time the AC machine reports 0 grams of refrigerant - you have a broken chiller with a 99% chance. The air conditioning gas pressure pumps the car's water system like an air compressor.

in Audi A3 e-tron (2013-2020)

Symptoms

Irregular A/C operation
No blowing from vents
Air conditioning does not turn on

DTC error codes

Battery Over Temp

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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

(8Y)

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

RS3 (8V / 8Y) - Platforma MQB (rynki poza UE mogą nadal posiadać R134a)

Refrigerant: R134a / R1234yf Amount (g): 450 - 525 ±25g Oil: ND-12 / PAG46yf Oil (ml): 110ml

e-tron (8V)

Refrigerant: R134a Amount (g): 500g Oil: G 052 535 M 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 A3 e-tron

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