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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 Audi A4 (B7)?

Clicking or rattling behind dashboard. Unusual noises when A/C is turned on

Q: How to fix No airflow from specific vents or clicking noise behind dashboard in Audi A4 (B7)?

Step 1: Perform Basic Settings (Grundeinstellung) in VCDS (channel 000 or 001) - forces full recalibration of the actuators. This will often fix the problem on its own without removing the board. Step 2: If the error returns - physically replace the damaged flap actuator. Grundeinstellung (Basic Settings) can save the cost of dismantling the dashboard (PLN 2,000-5,000 for labor). ALWAYS test Grundeinstellung first before ordering disassembly.

in Audi A4 (B7) (1994-2012)

Symptoms

Clicking or rattling behind dashboard
Unusual noises when A/C is turned on

DTC error codes

01271 - V68 blocked / no voltage

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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)

Refrigerant: R1234yf Amount (g): 580g Oil: PAG ISO 46 YF Oil (ml): 110ml

(B9)

Refrigerant: R1234yf Amount (g): 480-530g Oil: PAG YF ISO 46 Oil (ml): 120 - 150ml

S4 / RS4 (B9) - Wersje z czynnikiem R134a (590g) oraz R1234yf (525g)

Refrigerant: R134a / R1234yf Amount (g): 525 / 590 ±15g Oil: ND-12 / SP-A2 / PAG46yf Oil (ml): 100 / 110ml

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No airflow from specific vents or clicking noise behind dashboard

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in A4 (B7)

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