High Priority 99% confidence

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 Volkswagen Cupra Leon?

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

Q: How to fix Unusual noise and metallic grinding when A/C is on in Volkswagen Cupra Leon?

Replacement of the condenser and the MANDATORY installation of the optional protective grid (Honeycomb grid: 1K0 820 746, Clips: 3D0 867 646). Never replace the condenser in a Golf 7 or Cupra without adding an OEM mesh. The grille clips behind the lower grill and physically blocks the stones. Otherwise, the new condenser will fail after a month.

in Volkswagen Cupra Leon (2010-2022)

Symptoms

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

DTC error codes

Low pressure

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

kompresor Doowon DV9

Refrigerant: R1234yf Amount (g): 330g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 120ml

z silnikiem TSI i kompresorem Doowon DV9

Refrigerant: R1234yf Amount (g): 450g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 120ml

kompresor Doowon DV9

Refrigerant: R134a Amount (g): 380g Oil: PAG PAG 46 lub PAO 68 Oil (ml): 120ml

See full specification

Have this problem?

Generate a personalized AI report for your Volkswagen Cupra Leon or book a workshop visit.

Generate AI report Schedule visit