Description
VALEO CL18 alternator for 2.0L and 2.2L HDi engines for Citroën and Peugeot vehicles. With an overrunning (freewheel) pulley.
The Valeo CL18 180A alternator is a high-output replacement unit designed for a range of Citroën and Peugeot models equipped with 2.0 and 2.2 HDi diesel engines. Built with an overrunning pulley to reduce belt shock and noise, this alternator delivers stable charging under heavy electrical loads—ideal for vehicles with multiple accessories or aftermarket audio and lighting. Frequently searched by OE number, this unit corresponds to Stellantis references and aftermarket cross-codes, making it easy for professional technicians and DIY enthusiasts to find the correct part.
Technical information
- Manufacturer: VALEO
- Model: CL18, 180 A, With Overrunning (Freewheel) Pulley
- Product Codes: 9664074280
- Additional Numbers: 9803750980, 1648236080, 5705KR, 5702J4
Fitment And Applications
Designed for Citroën and Peugeot vehicles with 2.0L and 2.2L HDi engines. Common applications include Citroën C4 Picasso and early-generation Peugeot 3008 I and 5008 I. Always verify engine type and alternator mounting layout when selecting the part.
Function And Common Failure Modes
The alternator charges the battery and powers the vehicle electrical system while the engine runs. Typical failure causes include worn brushes, faulty voltage regulator, damaged diode rectifier, bearing wear leading to noise or seizure, contamination from oil or coolant leaks, and belt or tensioner issues that overload the unit. Heavy electrical loads and frequent short journeys accelerate wear.
Lifetime And When To Replace
Alternator lifespan depends on driving style and electrical demand; typical service life is in the range of 100,000–200,000 km (roughly 5–10 years) under normal conditions. Replace earlier if you notice dimming lights, battery warning lamp, unusual noises from the alternator, or unstable charging voltage.
Replacement And Installation Recommendations
- Disconnect the negative battery terminal before beginning work.
- Release and remove the drive belt by loosening the tensioner; mark belt routing if needed.
- Disconnect electrical connectors and the battery charging cable from the alternator.
- Unbolt the alternator mounting bolts and remove the unit from the engine bay; compare with the new unit for plug type and mounting locations.
- Install the new alternator, tighten mounting bolts to the manufacturer’s torque specifications, reconnect electrical connectors, and refit the drive belt with correct tension.
- Start the engine and verify charging operation—charging voltage should be approximately 14 V with the engine running and accessory load applied.
Installation Tips
Check the drive belt condition and the tensioner during replacement—worn belts or a failing tensioner will shorten alternator life. Inspect for oil or coolant leaks that could contaminate the alternator. Use correct electrical connectors and secure all earth points. If unsure about removal access or belt routing, consult the vehicle repair manual.
Why This Part Is Often Searched By Number
Mechanics and parts departments commonly search by OE reference to ensure exact fitment. The primary reference 9664074280 and the cross-numbers listed above are widely used identifiers for this Valeo CL18 180A alternator on Citroën and Peugeot HDi engines.
Reason For Most Frequent Failures
Most failures are caused by mechanical wear (bearings, brushes), thermal stress on diodes and regulator, or external contamination (oil, coolant). Electrical overload from additional accessories or poor belt tension also contributes to premature failure.
