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A/C cooling is weak and gradually loses performance

Q: How to fix A/C cooling is weak and gradually loses performance in Audi RS 5?

Poor cooling due to gas loss. The leak is diagnosed precisely (often using trace gas or UV) and is located directly on the condenser, exactly in the places where the aluminum cross tubes connect to the collection tank (weakening the factory brazing). Solution (according to TSB 2064077/6): Replacement of the defective condenser with a new one from an improved, reinforced production batch.

in Audi RS 5 (2017-2018)

Symptoms

Weak cabin cooling

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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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A/C cooling is weak and gradually loses performance

Symptoms

A/C Technical Specifications

Other problems in RS 5

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