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Unusual noise and metallic grinding when A/C is on

Q: What are the symptoms of Unusual noise and metallic grinding when A/C is on in Porsche Taycan (Y1A/Y1B/Y1C)?

No cold air from vents. Unusual noises when A/C is turned on. Vibrations or humming after turning on A/C

Q: How to fix Unusual noise and metallic grinding when A/C is on in Porsche Taycan (Y1A/Y1B/Y1C)?

Replacement of the electric air conditioning compressor with the latest, modernized version with part number 9J1-816-797-C (or higher) and correction of mounting points on the subframe using new vibration-isolating washers (in accordance with the guidelines of TSB Bulletin SY 86/23). Additionally, in the case of mechanical seizure, it is necessary to thoroughly rinse the entire system to remove metal filings and replace the expansion valves and the dryer. Ignoring the humming and vibration of the first series compressor leads to seizing and spreading of metal filings throughout the entire complex air conditioning system, which drastically increases the cost of repair (flushing the system). Always react to vibrations in advance.

in Porsche Taycan (Y1A/Y1B/Y1C) (2020-2024)

Symptoms

No cold air from vents
Unusual noises when A/C is turned on
Vibrations or humming after turning on A/C

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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

Platforma BEV 800V

Refrigerant: R1234yf Amount (g): 900g Oil: SP-A2 (POE) Oil (ml): 250ml

Platforma BEV 800V

Refrigerant: R134a Amount (g): 900g Oil: SP-A2 (POE) Oil (ml): 250ml

See full specification

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Unusual noise and metallic grinding when A/C is on

Symptoms

A/C Technical Specifications

Other problems in Taycan (Y1A/Y1B/Y1C)

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