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

No cold air from vents. Weak cabin cooling. Unusual noises when A/C is turned on. Frost or ice on pipes under the hood

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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 Volkswagen Jetta?

Valve diagnostics (no filings = replacement of the valve itself, e.g. 1K0260839). A lot of filings = replacement of the entire compressor, flushing the system and a new condenser. This is the most common failure of 'semi-functioning' air conditioning in the VAG group. Don't replace the compressor right away. Pull out the N280 valve at the back of the compressor, check the strainer. If it's clean, put in a new valve for a fraction of the price.

in Volkswagen Jetta (2006-2020)

Symptoms

No cold air from vents
Weak cabin cooling
Unusual noises when A/C is turned on
Frost or ice on pipes under the hood

DTC error codes

B10A911

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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

Najnowsza MQB / GLI

Refrigerant: R1234yf Amount (g): 460g Oil: PAG ISO 46 YF Oil (ml): b.d.ml

IV (162) Denso SES14C/Sanden 11PXE14

Refrigerant: R134a Amount (g): 500g Oil: PAG PAG 46 lub PAO 68 Oil (ml): 80ml

kompresor Denso SEU16C

Refrigerant: R134a Amount (g): 525g Oil: G 052 300 A2 PAO 68 lub PAG ISO 46 Oil (ml): 180ml

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Unusual noise and metallic grinding when A/C is on

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in Jetta

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