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Slow loss of refrigerant or A/C system leakage

Q: How to fix Slow loss of refrigerant or A/C system leakage in Audi A3 (8V)?

Locate the leak with a gas detector or UV dye, and then replace the defective O-rings with modernized versions resistant to reaction with the new R-1234yf refrigerant.

in Audi A3 (8V) (2020-2024)

Symptoms

Slow loss of refrigerant

DTC error codes

Low refrigerant 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

(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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Slow loss of refrigerant or A/C system leakage

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in A3 (8V)

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