High-quality replacement heater servo motor designed for climate control systems on Citroën and Peugeot models. This actuator controls air flap and blend door positions to regulate cabin temperature and airflow distribution. Ideal For Workshops And Do-It-Yourself Enthusiasts Searching By Part Number (EAD 552, 4puh-19e616-ab, 4puh-19e616-ac, 6447RJ). Reliable Fitment For Common Stellantis Platforms Used In Citroën C5 II, C6, Peugeot 407 And 607.

Key Benefits

Restores Precise Climate Control: Eliminates Erratic Airflow And Incorrect Temperature Mixing. Quiet Operation: Smooth Motor Drive Minimizes Rattles And Noise From The Dashboard. Direct Replacement: Designed To Match Original Mounting And Electrical Connector Layout For Easier Installation.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C5 II; Citroën C6; Peugeot 407; Peugeot 607
• Product Codes: EAD 552; 4puh-19e616-ab; 4puh-19e616-ac
• Other Numbers: 6447RJ

Function And Symptoms

The Heater Servo Motor Operates The Blend And Mode Flaps Inside The HVAC Box, Allowing The Climate Control Unit To Direct Airflow And Mix Hot And Cold Air For The Desired Cabin Temperature. Common Symptoms Of A Failing Servo Include Unresponsive Temperature Changes, Incorrect Air Distribution (e.g., Only Defrost Or Feet Vents Active), Clicks Or Grinding From Behind The Dashboard, And Intermittent Operation.

Why The Part Fails Most Often

Failure Is Typically Caused By Worn Plastic Gear Teeth, Deteriorated Motor Brushes, Or Internal Corrosion From Moisture. Excessive Force On Stiff Flap Mechanisms Or Foreign Debree Entering The HVAC Box Can Accelerate Wear. Age And Frequent Thermal Cycling In The HVAC System Also Contribute To Reduced Actuator Life.

How To Replace

Replacement Usually Requires Accessing The HVAC Box Behind The Glovebox Or Lower Dash Trim. Typical Steps:

• Disconnect Battery Before Starting Work.
• Remove Glovebox Or Necessary Trim Panels To Access The Actuator.
• Unplug Electrical Connector And Remove Fasteners Holding The Servo In Place.
• Swap The Unit, Refit Fasteners, Reconnect The Connector And Reassemble Trim.
• Perform Any Required HVAC Self-Calibration Through The Vehicle Controls If Applicable.

Estimated Labor Time: 0.5–2.0 Hours Depending On Model And Required Disassembly.

Installation Recommendations

• Use Proper Trim Tools To Avoid Damaging Panels And Clips.
• Verify Connector Pins Are Clean And Undamaged Before Reconnecting.
• If You Encounter Stiff Flaps, Inspect The HVAC Box For Obstructions Or Broken Linkages Before Fitting The New Servo.
• After Installation, Cycle The Climate System Through All Modes To Confirm Correct Operation.

Compatibility And Search Tips

Customers Often Search By Part Number—Include EAD 552, 4puh-19e616-ab, 4puh-19e616-ac And 6447RJ When Looking For This Actuator. Fitment Covers Citroën C5 II, Citroën C6, Peugeot 407 And Peugeot 607 Models That Use The Same HVAC Servo Configuration.

Additional Notes

This Unit Is Intended As A Direct Replacement For The Listed Models. For Complex Diagnostics Or If The Climate System Requires Coding/Calibration Beyond Basic Cycling, Consider Professional Service With Proper Diagnostic Equipment.

This HVAC servo motor (heater actuator) is designed for Citroën and Peugeot vehicles and is commonly referenced under codes such as 6447RJ, EAD 552 or 4puh-19e616-ac. It controls the position of ventilation and heating flaps inside the heater box to ensure correct air distribution and temperature mixing. A direct replacement for worn or noisy actuators, it restores precise climate control, eliminates abnormal flap noise and prevents incorrect temperature distribution that frustrates drivers and workshops alike.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C5 (second generation), Citroën C6, Peugeot 407, Peugeot 607
• Product Codes: 4puh-19e616-ac, EAD 552, 6447RJ
• Other Numbers: 6447RJ (alternative reference often used by workshops)

Fitment And Application

Suitable for climate control systems in Citroën C5 II, Citroën C6, Peugeot 407 and Peugeot 607. Frequently searched by part numbers (6447RJ, EAD 552, 4puh-19e616-ac), so check the code against your defective unit to confirm compatibility before installation.

Common Symptoms And Failure Modes

• Intermittent or constant grinding, clicking or buzzing from the dashboard area.
• Vent flaps stuck in one position, incorrect air distribution or inability to change temperature properly.
• Electrical failure of the small DC motor, seized or stripped plastic gears, connector corrosion or water ingress from heater box leaks.
• Failures often develop gradually—noise or sluggish flap movement is usually an early sign.

Installation Recommendations

General replacement steps used by professional technicians and experienced DIYers:

• Disconnect the negative battery terminal before starting to avoid electrical shorts and to prevent unintended airbag deployment while working near the dash.
• Gain access to the actuator—depending on the model this typically requires removal of the glovebox or lower dashboard trim to reach the heater box from the passenger side.
• Unplug the electrical connector, remove the retaining screws, and extract the old actuator. Inspect the flap mechanism for debris or broken teeth that could damage a new actuator.
• Install the new servo motor in the correct orientation, secure with screws, reconnect the electrical connector and reassemble the trim panels.
• After fitting, verify full range of motion by cycling the climate control through different modes and temperatures. Some vehicles may self-calibrate the actuator on first run; others may require a simple manual alignment procedure—consult workshop manuals for model-specific steps.

Why This Part Fails Most Often

Actuators operate continuously over many years and are subject to thermal cycling, dust infiltration and moisture. The most common causes of failure are worn or stripped plastic gears, motor burnout from heavy use, and corrosion of electrical connectors. Water ingress from heater core leaks or clogged drainage can accelerate deterioration. Regular inspection during HVAC repairs can reveal early wear and prevent secondary damage to ducting or adjacent components.

Order using the part codes 4puh-19e616-ac, EAD 552 or 6447RJ to find the correct replacement quickly. Replacing a faulty servo motor typically restores normal climate function and eliminates related dashboard noises.