The Valeo CL18 180A alternator is a high-output charging unit designed for PSA Group vehicles equipped with 2.0 and 2.2 HDi diesel engines. Built with a freewheel (one-way) pulley to protect the belt drive from torsional shocks, this alternator supplies stable current for heavy electrical loads found in modern Citroën and Peugeot cars. Ideal for professional mechanics and experienced DIYers who need a reliable replacement part that meets the electrical demands of late-model HDi powertrains.

Key Features

• High output: 180 A nominal capacity suitable for vehicles with multiple electrical consumers (heated seats, infotainment, extra lighting).
• Freewheel Pulley: Integrated overrunning pulley to reduce belt stress and extend accessory drive life.
• Direct Fit: Designed as a replacement for Valeo CL18 alternators used on PSA 2.0/2.2 HDi engines.
• Multiple Cross-References: Compatible with a range of OEM/product numbers (see Technical Information).

Compatibility And Applications

Suitable For Citroën And Peugeot Models Equipped With 2.0L And 2.2L HDi Engines. Examples Include Common PSA Platforms Fitted With CL18/180A Alternators (e.g., Certain Citroën C5/C6 And Peugeot 407/607 Applications). Always Fit According To Vehicle Specification And Engine Variant.

Technical Information

• Manufacturer: Valeo
• Model: CL18 (180 A), Freewheel Pulley
• Product Codes: 9661544880; 9688085380; 5702K8; 5705AX; 5705EE; 5705JF; 5705E7; 5705NG; 5702F4; 5702G2
• Additional Numbers: 180A; CL18

How The Alternator Works

The alternator converts mechanical energy from the engine into electrical power to charge the battery and supply vehicle electrical systems. The voltage regulator controls output to maintain system voltage (typically around 13.8–14.6 V under load). The freewheel pulley decouples torsional vibrations from the accessory belt, reducing stress on the belt and bearings.

Replacement Procedure (Overview)

• Safety First: Disconnect the negative battery terminal before any work on the charging system.
• Remove Drive Belt: Relieve tension from the accessory belt and remove it from the alternator pulley.
• Disconnect Electrical Connectors: Unplug the alternator electrical connector and battery feed (observe nut size and connection orientation).
• Unbolt Alternator: Remove mounting bolts and extract the unit from its brackets.
• Install New Alternator: Position new alternator, tighten mounting bolts to manufacturer specification, reconnect electrical plugs and battery feed, and fit the drive belt with correct tension.
• Verification: After reconnecting the battery, start the engine and check charging voltage and belt alignment. Inspect for abnormal noise indicating pulley or bearing issues.

Installation Recommendations

• Always Disconnect The Battery Before Starting Work And Follow Manufacturer Procedures.
• Inspect Drive Belt And Tensioner; Replace If Worn Or Damaged To Prevent Premature Alternator Failure.
• Check Battery Condition Prior To Installation—A Weak Battery Can Overload A New Alternator.
• Ensure Electrical Connections Are Clean And Secure; Corroded Terminals Can Cause Voltage Drops.
• After Installation, Measure Charging Voltage Under Idle And Load To Confirm Proper Operation (Approx. 13.8–14.6 V).
• If The Freewheel Pulley Is Replaced Or Disturbed, Ensure Correct Orientation And That The Pulley Frees In The Correct Direction.

Why Alternators Like This Fail

• Bearing Wear: Bearings Exposed To High Loads Or Contamination Can Produce Noise And Eventually Seize.
• Brush And Slip Ring Wear: Mechanical Wear Of Brushes Leads To Poor Contact And Reduced Output.
• Rectifier/Diode Or Regulator Failure: Electronic Components Can Fail Due To Heat Or Electrical Surges.
• Contamination: Oil, Coolant, Or Debris Entering The Unit Can Damage Bearings And Electronics.
• Accessory Overload: Additional Electrical Equipment Or A Failing Battery Increases Stress On The Alternator.

Part Numbers And Cross-Reference Codes Are Included In The Technical Information Section To Help Locate The Correct Replacement. For Professional Fitment, Use Proper Tools And Observe Manufacturer Torque And Safety Guidelines.

High-output 180A Mitsubishi CL18 alternator designed for PSA Group 2.0 and 2.2 HDi diesel engines. This robust unit is a direct-fit replacement on many Citroën and Peugeot models and carries multiple OEM reference numbers commonly searched by professional mechanics and DIY enthusiasts. The alternator delivers stable charging current for vehicles with increased electrical demand (start-stop excluded) and is suitable for cars equipped with advanced infotainment, lighting and auxiliary systems.

Fitment And Typical Applications

Fits a range of Citroën and Peugeot models with 2.0 / 2.2 HDi engines. Typical applications include:

• Citroën C4
• Citroën C4 Picasso
• Citroën C5 (including C5 X7)
• Citroën C8
• Peugeot 3008 I
• Peugeot 307
• Peugeot 407
• Peugeot 5008 I
• Peugeot 807

Technical Information

• Manufacturer: Mitsubishi (Unit Used On Stellantis Citroën/Peugeot)
• Model: CL18 180A
• Product Codes: 9654752880, 5702K8, 5705AX, 5705EE, 5705JF, 5705E7, 5705NG, 5702F4, 5702G2
• Additional Numbers: 9646065180, 9661544880

How To Replace

General replacement overview for experienced mechanics and competent DIYers:

• Disconnect Battery: Always disconnect the negative terminal of the battery before any work on the charging system.
• Remove Drive Belt: Release tensioner and remove accessory drive belt or serpentine belt from alternator pulley.
• Disconnect Electrical Connectors: Unplug the main charging lead and regulator connector (ensure connectors are clean and undamaged).
• Remove Mounting Bolts: Support the alternator, remove the mounting bolts and lower the unit from its bracket.
• Install New Alternator: Position new alternator, tighten mounting bolts to manufacturer’s specification, reconnect electrical connectors and refit the drive belt with correct tension.
• Final Check: Reconnect battery, start engine and verify charging voltage (typically around 13.8–14.6 V with engine running). Check for unusual noises and secure mounting.

Installation Recommendations

• Use A Torque Wrench: Tighten mounting fasteners to the vehicle manufacturer’s torque specifications to avoid misalignment or damage.
• Inspect Related Components: Check belt condition and tensioner, battery state of charge and ground connections before installation.
• Protect Electrical Contacts: Ensure connectors and the main charging terminal are clean, tight and free of corrosion.
• Perform A Charging System Test: After installation use a multimeter or professional charging tester to confirm correct output and regulator function.

Why This Part Fails Most Often

• Bearing Wear: Bearings wear over time and produce noise or eventual seizure, often caused by high mileage or contamination.
• Regulator Or Brush Wear: Internal voltage regulator or carbon brushes can wear, causing undercharging or overcharging.
• Diode Pack Failure: Rectifier diodes can fail, leading to AC ripple, battery discharge or electrical interference.
• Contamination And Overheating: Oil or coolant leaks, or clogged cooling passages, reduce alternator cooling and shorten life.
• Belt Slippage: Worn or loose drive belts reduce output and increase heat and wear on the alternator pulley and bearings.

Expected Durability: Under normal conditions alternators often last well over 100,000 km, but lifespan depends on vehicle use, maintenance and exposure to contaminants. Symptoms of a failing alternator include warning lights on the dash, dimming lights, unusual noises from the front of the engine and battery discharge.

Post-Installation Checks

• Verify Charging Voltage: Engine idling should register stable charging voltage (approx. 13.8–14.6 V).
• Listen For Noises: Ensure no grinding or whining noises indicate bearing or alignment problems.
• Reinspect Connections: After a short test drive recheck electrical connections and belt tension.

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