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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 Citroën C4 Picasso (I/II)?

Different temperature on both sides of the cabin. Frost or ice on pipes under the hood

Q: How to fix No airflow from specific vents or clicking noise behind dashboard in Citroën C4 Picasso (I/II)?

Replacing the flap actuator (so-called motorinho). PSA offers repair kits (Part No: 6450.XZ) containing reinforced sprockets and axle extensions. There is no need to dismantle the entire board! Access to the passenger side actuator is available after removing the glove compartment, and to the driver's side after removing the covers above the pedals. The 6450.XZ kit solves the problem permanently at a fraction of the price of a new heater.

in Citroën C4 Picasso (I/II) (2006-2018)

Symptoms

Different temperature on both sides of the cabin
Frost or ice on pipes under the hood

DTC error codes

Air distribution motor fault

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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

III - (B4)

Refrigerant: R1234yf Amount (g): 420-470g Oil: PAG YF ISO 46 Oil (ml): 110 - 140ml

Cactus 1,2 i

Refrigerant: R1234yf Amount (g): 420g Oil: SPA2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 85ml

Cactus 1,6 HDi

Refrigerant: R1234yf Amount (g): 420g Oil: SPA2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 85ml

See full specification

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