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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 SEAT Leon (5F)?

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

Q: How to fix No airflow from specific vents or clicking noise behind dashboard in SEAT Leon (5F)?

Replacement of damaged stepper motors (actuators) with new ones with improved potentiometers (often Denso/Valeo) + adaptation of basic settings in VCDS. If you have a potentiometer error, try spraying a Kontakt PR preparation (for potentiometer regeneration) inside the motor (on the treadmill). This often helps for several months and allows you to save PLN 300 on a new engine and the nightmare of replacing it in a tight dashboard.

in SEAT Leon (5F) (2012-2020)

Symptoms

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

DTC error codes

B109415 / B109515 (Flap motor stuck)

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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

IV - (KL)

Refrigerant: R1234yf Amount (g): 430-480g Oil: PAG YF ISO 46 Oil (ml): 120 - 140ml

III - (5F)

Refrigerant: R134a Amount (g): 450-500g Oil: PAG 46 Oil (ml): 120 - 140ml

II kompresor Denso 7SEU17C

Refrigerant: R134a Amount (g): 500 – 550g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 130 – 150ml

See full specification

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