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No airflow from specific vents or clicking noise behind dashboard

Q: What are the symptoms of No airflow from specific vents or clicking noise behind dashboard in Volkswagen Passat B6/B7?

Different temperature on both sides of the cabin. Clicking or rattling behind dashboard. Unusual noises when A/C is turned on. A/C does not react to control panel settings

Q: How to fix No airflow from specific vents or clicking noise behind dashboard in Volkswagen Passat B6/B7?

1. Recalibration VCDS or from the panel (AC + Face fan). 2. If the ticking returns, replace the damaged motor. Before you start disassembling the board, try resetting it using a combination of keys on the panel. If the knocking stops and the temperatures return, the potentiometer was just dirty. If it comes back, the motor needs to be replaced.

in Volkswagen Passat B6/B7 (2005-2018)

Symptoms

Different temperature on both sides of the cabin
Clicking or rattling behind dashboard
Unusual noises when A/C is turned on
A/C does not react to control panel settings

DTC error codes

04F7

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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

B9 (CJ5)

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

(B8) kompresor Denso 6SES14C + 6SAS14

Refrigerant: R1234yf Amount (g): 460g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 110ml

(B8) kompresor MAHLE/Delphi 6CVC140 + Visteon

Refrigerant: R1234yf Amount (g): 460g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 120ml

See full specification

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