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

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

High Priority 99% confidence

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 T-Roc?

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 T-Roc (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

(A1)

Refrigerant: R1234yf Amount (g): 450-500g Oil: PAG YF ISO 46 Oil (ml): 120 - 140ml

kompresor Denso

Refrigerant: R1234yf Amount (g): 460g Oil: G 055 535 M2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 110ml

kompresor MAHLE

Refrigerant: R134a Amount (g): 500g Oil: G 052 154 A2 PAO 68 AA1 lub PAG ISO 46 Oil (ml): 110ml

See full specification

Have this problem?

Generate a personalized AI report for your Volkswagen T-Roc or book a workshop visit.

Generate AI report Schedule visit