What are the symptoms of Hissing from vents and slow loss of refrigerant in Audi RS5?

No cold air from vents. Unusual noises when A/C is turned on

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Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in Audi RS5?

Full replacement of the evaporator with a corrected part.

in Audi RS5 (2017-2018)

Symptoms

No cold air from vents
Unusual noises when A/C is turned on

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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

kompresor Zexel/Denso

Refrigerant: R134a Amount (g): 600g Oil: PAG PAG 46 lub PAO 68 Oil (ml): 150ml

See full specification

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Hissing from vents and slow loss of refrigerant

Symptoms

A/C Technical Specifications

Other problems in RS5

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