What are the symptoms of Unusual noise and metallic grinding when A/C is on in Skoda Roomster?

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

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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 Skoda Roomster?

Verification of the N280 valve with pressure gauges or an oscilloscope. Disassembly of the N280 valve to inspect the filter (strainer). If the strainer is clean, replace the N280 valve with a new one without replacing the entire compressor. If there are metal filings and dark slime on the strainer (marks of seizing), it is absolutely necessary to replace the entire Sanden PXE16 compressor, the condenser with dryer, the expansion valve and pressure flush the entire circuit.

in Skoda Roomster (2011-2024)

Symptoms

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

DTC error codes

No codes in the controller

Verifying license...

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

Praktik - kompresor Delphi/Zexel

Refrigerant: R134a Amount (g): 525 – 575g Oil: G 052 300 A2 PAO 68 lub PAG ISO 46 Oil (ml): 120ml

Praktik - kompresor Denso

Refrigerant: R134a Amount (g): 500g Oil: G 052 300 A2 PAO 68 lub PAG ISO 46 Oil (ml): 90ml

See full specification

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