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

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 TT RS?

RS3/TT RS (TSB 2056182/4): installation of a balancing weight (damper) on the AC cable under the hood. A6/A7 (TSB 2044717/1): replacement of one flexible hose with a built-in pulsation damper and renovation of the compressor with centering sleeves. If the choke is at fault: replace the expansion nozzle + dryer cartridge + flush the system (TSB 2061277/2). If the noise disappears completely when the AC is turned off = resonance problem or choke. If the noise is also without AC = compressor pulley bearing.

in Audi TT RS (2012-2023)

Symptoms

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

DTC error codes

No faults

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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

(FV) kompresor Denso/Delphi/MAHLE

Refrigerant: R134a Amount (g): 500g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 110ml

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 TT RS

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