What are the symptoms of Unusual noise and metallic grinding when A/C is on in Audi A3 Cabriolet?

No cold air from vents. Weak cabin cooling. Unusual noises when A/C is turned on. Warning light on dashboard

High Priority 95% confidence

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 A3 Cabriolet?

Removal and replacement of the air conditioning compressor, replacement of the condenser with dryer, replacement of the expansion valve and thorough flushing of the entire refrigeration system before refilling.

in Audi A3 Cabriolet (2015-2015)

Symptoms

No cold air from vents
Weak cabin cooling
Unusual noises when A/C is turned on
Warning light on dashboard

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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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