This climate control unit from DENSO is intended for first‑generation Citroën C4 Picasso and Grand Picasso models. It is identified by part numbers 9665811880, 9665811880-00 and internal references 6452P7 / 6452P8, commonly used across Stellantis Citroën/Peugeot HVAC systems. The unit controls cabin temperature regulation and related actuators, making it a key component for reliable heating, ventilation and air‑conditioning operation.

Function And Application

The Unit Manages Central HVAC Functions Including Temperature Regulation, Blower Control Signals, Air Recirculation Command, Actuator/Flap Positions And The Signal To The Air Conditioning Compressor Clutch. On Vehicles With Automatic Climate Control, The Module Processes Inputs From Temperature Sensors And User Controls To Maintain Set Temperatures. Correct Identification By Part Number Is Important To Ensure Full Compatibility With Vehicle Wiring And Sensor Inputs.

Replacement Procedure (Overview)

• Prepare: Park On A Level Surface, Engage Parking Brake And Remove Ignition Key.
• Safety: Always Disconnect The Negative Battery Terminal Before Starting Work To Prevent Short Circuits Or Damage To Electronic Modules.
• Access: Remove Trim Panels And Center Console Elements As Required To Reach The HVAC Control Unit Behind The Dash. Keep Fasteners Organized.
• Disconnect: Carefully Unplug All Electrical Connectors And Remove Any Retaining Screws Or Clips. Inspect Connectors For Corrosion Or Bent Pins.
• Install: Fit The Replacement Unit, Reconnect Connectors Firmly, Reassemble Trim, And Reconnect The Battery.
• Verification: Cycle The HVAC System Through All Modes And Check Blower Function, Temperature Changes And Flap Movement. Clear Any Stored Fault Codes If Present.

Installation Recommendations

• Always Disconnect The Battery Before Removal And Follow Manufacturer Procedures To Avoid Damage To The Unit.
• Inspect Wiring Harnesses, Connectors And Fuses For Corrosion Or Heat Damage; Repair As Needed Before Installing The New Unit.
• If The Vehicle Shows Stored HVAC Fault Codes, Read And Clear Codes With A Diagnostic Tool After Replacement To Confirm Proper Operation.
• Handle The Unit Carefully To Avoid ESD And Mechanical Shock; Mount Securely To Prevent Vibration‑Induced Failures.
• When Possible, Compare Part Numbers 9665811880 / 9665811880-00 / 6452P7 / 6452P8 With The Original Unit To Ensure Direct Fitment.

Most Common Reasons For Failure

• Water Ingress Or High Humidity Leading To Corrosion On Circuit Board Or Connectors.
• Thermal Stress And Ageing Of Electronic Components Causing Intermittent Faults Or Complete Loss Of Function.
• Damaged Connector Pins Or Wiring Harness Faults Resulting In Poor Signal Transmission.
• Mechanical Wear Of Potentiometers Or Internal Actuators Triggering Incorrect Sensor Readings.
• Electrical Surges Or Short Circuits Causing Component Damage—often Related To Faulty Wiring Or Failed Relays/Fuses.

Technical Information

• Manufacturer: DENSO
• Model: Citroën C4 Picasso, Citroën Grand Picasso (First Series)
• Product Codes: 9665811880, 9665811880-00
• Additional Numbers: 6452P7, 6452P8

Suitable For Automechanics And Experienced DIY Enthusiasts Who Are Comfortable Working With Vehicle Electronics. Correct Identification By Part Number And Careful Handling During Installation Will Ensure Reliable Climate Control Operation.

Part description

This air conditioning control unit (HVAC module) from Valeo is designed for Citroën and Peugeot cars. It is a used original part from a Peugeot 308 T9 car, suitable as a replacement for air conditioning control malfunctions, when the system does not respond correctly to settings, reports errors or does not work stably.

The advantage is availability according to the product number – if the codes match, you can easily replace the original unit without unnecessary searching.

Technical information

• Manufacturer: Valeo
• Model: Peugeot 308 T9 (part origin)
• Other numbers: 1692723680

Product codes

• Product codes: 9836666580, 1613153580

Installation recommendations

• Before assembly, compare the part numbers on the unit label with the original part (especially 9836666580 / 1613153580).
• It is recommended to carry out the assembly in a dry environment and check the condition of the connectors and wiring (oxidation, loose pins).
• After replacement, check the function of the air conditioner, including all modes and responses to controls.

Reasons why the part is damaged

• Moisture in the unit space and subsequent corrosion of connectors or electronics.
• Surge in the on-board network (e.g. during charging problems, weak battery or unprofessional interventions).
• Damage to cabling or connectors (loose contacts, broken wires, bad grounding).
• Thermal stress and aging of electronic components.

Original air conditioning control unit for Citroën C -Crosser and Peugeot 4007. These are part of the PSA score 7820A404 and 1606379880, also compatible by wellaries 7520A404 and 1606439280. or is the cuneproof temperature regulation.

The unit ensures communication within the vehicle network and controls the key air conditioning functions: compressor switching, fan control, mixing and distribution flaps and evaluation of temperature sensors. In exchange for the original part you will get full compatibility and proper function with controls in the center panel.

Suitable for Citroën C -Crosser and Peugeot 4007 from the production period approximately 2007–2012. It is a proven repair solution, such as a non -functional car mode, temperature fluctuations, non -firing compressor or air conditioning error message.

Installation usually takes place without programming: disconnect the battery, remove the center console cover, release the unit, disconnect the connector (s) and replace with this piece. After installation, these cars are usually carried out automatic flap initialization after the ignition is turned on and the first air conditioning is started. It is recommended to compare the shape of the connectors and the number of the part before ordering.

technical information

• manufacturer: dog (Citroën | Peugeot) OEM
• Model: Citroën C -Crosser; Peugeot 4007 (about 2007–2012)
• product codes: 7820A404, 1606379880
• Other numbers: 7520A404, 1606439280

As an original part used, this is the ideal replacement for fast and cost -effective air conditioning repair. For proper compatibility, always verify the conformity of the catalog numbers and compare the connectors visually.

Looking for a reliable replacement to manage the air conditioning system in your Citroën C4 Picasso? This fully functional Air Conditioning Control Unit manufactured by DENSO is designed specifically for Citroën C4 Picasso and Grand Picasso models. It is an excellent choice to restore comfort and efficiency to your vehicle’s climate control system.

The air conditioning control unit is a critical component that governs temperature regulation, airflow distribution, and the amount of cooled air inside the cabin. It ensures a pleasant interior climate regardless of external weather conditions. While this part comes from a used vehicle, it is in full working order, guaranteeing reliable performance.

Technical Information

• Manufacturer: DENSO
• Model: Citroën C4 Picasso, Citroën C4 Grand Picasso
• Product Codes: 9665811780, 9665811780-00
• Additional Numbers: 6452P7, 6452P8

This control unit is often sought after due to its specific role within the air conditioning system, and replacement may be necessary due to normal wear or malfunction. By choosing this product, you can significantly save compared to purchasing a new unit while maintaining high quality and functionality.

If you are searching for a quality and verified component for your Citroën C4 Picasso, this product is an ideal solution that meets expectations for performance and affordability.

This control unit is an essential component that often undergoes wear due to its frequent activation in daily vehicle operation. Replacing a faulty or worn unit can significantly enhance your air conditioning system’s effectiveness and overall driving comfort.

Installation is straightforward and can be performed at home with basic tools and mechanical skills, or professionally at your trusted auto repair shop. Post-installation, it’s recommended to have the system inspected and calibrated for optimal performance.

Technical Information:

• Manufacturer: DENSO
• Model: Citroën C4 Picasso, Citroën C4 Grand Picasso
• Product Codes: 9654654880, 9654654880-00, 6452P7

Don’t wait for your old unit to fail and compromise your vehicle’s air conditioning function. This quality replacement part offers excellent value compared to the cost of new original components and is ready for immediate installation and use.

This climate control unit from the renowned manufacturer Valeo is designed for a range of Citroën and Peugeot models. It is a crucial component that ensures the proper functionality and efficiency of your vehicle’s air conditioning system. If you experience irregular cooling or AC failures, this unit is often the root cause.

Technical Information:
Manufacturer: Valeo
Model Compatibility: Citroën C3 Aircross, C3 III, C4 Cactus, C4 Picasso II; Peugeot 308 T9
Product Codes: 9811039380 1618038180 1695157880
Additional Numbers: Additional reference numbers may apply to verify compatibility with your vehicle.

Installation should be performed by a professionally trained technician to guarantee system safety and functionality. As a key part of the air conditioning system, regular inspection and maintenance are recommended to prevent unexpected failures that could lead to costly repairs.

When replacing this unit, a thorough diagnosis of the entire AC system is necessary to ensure no other components are damaged and the new unit functions correctly with the rest of the system.

This part is ideal for both car owners and professional mechanics seeking a reliable and effective solution to repair or restore the air conditioning system in Citroën and Peugeot vehicles. Thanks to Valeo’s precise manufacturing and high-quality materials, you can expect long-lasting performance and trouble-free operation of your AC system.

Always confirm compatibility of this unit with your vehicle using the listed product codes to avoid installation issues and ensure proper functionality in your specific model.

Product Overview

This DENSO Climate Control Unit is a direct-fit HVAC controller designed for Citroën C4 Picasso and Grand Picasso models manufactured up to 2013. The module manages automatic climate functions including temperature regulation, fan speeds, air distribution, recirculation control and communication with the A/C compressor clutch and cabin sensors. Frequently searched by part numbers 9660069280, 6451XK and 6452P8, this unit is intended for professional garages and competent DIY mechanics who need a reliable replacement part for climate system faults.

Fitment And Replacement

Location: The climate control unit is located in the center of the dashboard/center console behind the climate fascia. Removal typically requires removal of surrounding trim panels and the control panel screws to access the module and its electrical connectors.

Replacement Steps (summary):

• Disconnect the battery before starting work to avoid short circuits and damage to vehicle electronics.
• Remove dashboard trim pieces and the climate control fascia using appropriate trim tools to avoid damage to panels.
• Unscrew the control unit fasteners and carefully unplug all electrical connectors and any vacuum/actuator hoses if present.
• Fit the new unit, reconnect connectors ensuring firm engagement, reassemble trim and reconnect the battery.
• Verify full function: blower speeds, temperature control, A/C clutch engagement, recirculation and display indicators. Check for stored fault codes and clear if necessary.

Estimated Time: 0.5–2 hours depending on experience and access to trim tools. Some vehicles may require additional time for dashboard components removal.

Technical Information

• Manufacturer: Denso
• Model: Citroën C4 Picasso; Grand Picasso (up to 2013)
• Product Codes: 9660069280; 6451XK; 6452P8
• Other Numbers: HW 04.00; SW 12.00

Installation Recommendations

Always disconnect the negative battery terminal before removing or installing the unit. Use plastic trim tools to avoid scratching interior parts. Handle the control unit by its housing and avoid touching circuit contacts. Inspect the connector pins for corrosion or bent pins before installation and ensure connectors are fully seated. After installation, perform a full functional check of climate operations and monitor for any fault codes. If fault codes persist, inspect related actuators, sensors and wiring harness for faults before replacing the module again.

Why The Part Most Often Fails

Common causes of failure include moisture ingress and connector corrosion, thermal stress and failed solder joints, worn internal relays or potentiometers, and electrical surges. Symptoms that indicate a failing climate control unit are intermittent or complete loss of temperature control, non-functional blower speed stages, stuck air distribution modes, A/C compressor not engaging while other systems are OK, or error messages on the vehicle diagnostics. Addressing humidity or wiring issues early can extend the service life of the replacement unit.

Notes For Mechanics And DIYers

This unit is a genuine-style electronic control module and requires careful handling. For vehicles that show persistent communication errors after replacement, verify related sensors and actuators and inspect the vehicle ground points. For complete system diagnostics and if coding or calibration appears necessary, use appropriate diagnostic tools compatible with PSA vehicles.

Failure of the air conditioning control unit can lead to inadequate cooling or heating in the cabin, affecting your overall driving experience. This unit is designed to interface with the vehicle’s climate control system for smooth operation, ensuring that your vehicle maintains the desired temperature effectively.

Replacement of the air conditioning control unit is straightforward. It typically involves disconnecting the battery, removing the dashboard panel, and carefully unplugging the old unit before installing the new one. It is advisable to replace this unit every few years or if you notice a decline in performance, as wear and tear can cause internal failures over time.

Technical Information

• Manufacturer: DENSO
• Model: Citroën C4 Picasso
• Product Codes: 9677334580, 9677334580-00
• Additional Numbers: None available

It is known that over time, air conditioning units may fail due to wear and tear, often caused by refrigerant leaks or electrical issues. Replacing your control unit can resolve these issues and restore functionality to your car’s climate system.

Designed specifically for Citroën models, this high-quality unit promises reliability and efficiency in regulating air temperature. Mechanics and auto enthusiasts highly recommend keeping a spare control unit, especially before the summer months when air conditioning is most needed.

Technical Information

• Manufacturer: Valeo
• Model: Citroën Xsara, Citroën Xantia
• Product Codes: 9635623080, 6445KH
• Additional Numbers: NFP

Commonly sought by automotive mechanics and DIY car enthusiasts, this ECU is identified by product numbers 6445HY and 6445RQ. Regular replacement is recommended if you notice any inconsistencies in your climate control system, as these units can wear out over time due to environmental exposure and continuous use.

Replacing the ECU AC is a straightforward process that involves disconnecting the battery, removing the old unit, and installing the new one in its place. Access to this component may require some disassembly of the dashboard, so be prepared with the right tools.

Technical Information

• Manufacturer: Valeo
• Model: Citroën Xsara II
• Product Codes: 6445HY, 6445RQ
• Additional Numbers: 9636522080, 69509000.G