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A/C cooling is weak and gradually loses performance

Q: How to fix A/C cooling is weak and gradually loses performance in Audi A3?

Complete replacement of the faulty condenser with a new, original condenser with improved tube soldering technology or a high-quality replacement, combined with the replacement of the dryer.

in Audi A3 (2010-2020)

Symptoms

Slow loss of refrigerant

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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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A/C cooling is weak and gradually loses performance

Symptoms

A/C Technical Specifications

Other problems in A3

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