What are the symptoms of Unusual noise and metallic grinding when A/C is on in Audi RS3?

Unusual noises when A/C is turned on. Vibrations or humming after turning on A/C

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Unusual noise and metallic grinding when A/C is on

Q: How to fix Unusual noise and metallic grinding when A/C is on in Audi RS3?

Installing a balancing weight (damper) on the air conditioning pipe or replacing the pipe with a version with a vibration damper and centering sleeves. Do not replace the compressor if it cools and simply hums with speed. The manufacturer released sets of weights that dampen the acoustic wave on the tube under the hood.

in Audi RS3 (2017-2023)

Symptoms

Unusual noises when A/C is turned on
Vibrations or humming after turning on A/C

DTC error codes

Brak

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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

3 z silnikiem 5-cylindrowym

Refrigerant: R134a Amount (g): 500g Oil: PAG PAG 46 lub PAO 68 b.d. RS Oil (ml): b.d.ml

5 kompresor Denso 7SEU17

Refrigerant: R134a Amount (g): 570g Oil: PAG PAG 46 lub PAO 68 Oil (ml): 150ml

See full specification

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Unusual noise and metallic grinding when A/C is on

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in RS3

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