Description
Three-way cooling relay for Citroën and Peugeot vehicles
This three-way cooling relay with a short length of wiring harness is designed for Citroën and Peugeot cooling fan systems. It provides reliable switching between fan circuits or stages to ensure optimal engine temperature control under varying load and ambient conditions. Supplied with original-style connector and wiring stub, it is a direct-fit replacement for vehicles using the listed OE numbers and is suitable for professional workshops and skilled DIYers.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Cooling Fan Relay Assembly (Three-Way)
- Product Codes: 9652021180, 9652021280, 9662570980, 6500EJ
- Additional Numbers: 9652021180 9652021280 9662570980 6500EJ
Fitment / Compatible Models
Commonly fitted to various Citroën and Peugeot models, including but not limited to:
- Citroën Berlingo B9 / Berlingo III
- Citroën C4 Picasso
- Citroën C5
- Peugeot 207
- Peugeot Partner III / Partner Tepee
Function And Typical Symptoms
The relay controls the cooling fan circuits, allowing activation of different fan stages or switching between multiple fan motors. Proper relay operation maintains engine temperature by engaging fans when the engine or air conditioning requires additional cooling. Symptoms of a failing relay include fans not running at all, fans stuck on a single speed, intermittent fan operation, engine overheating under load, or erratic cooling fan behavior.
Replacement Instructions
Basic replacement procedure for experienced technicians and competent DIYers:
- Prepare Tools: Basic hand tools (screwdrivers, pliers, small socket set) and safety gloves.
- Safety First: Disconnect the negative battery terminal before starting work to prevent short circuits.
- Locate Relay: Identify the cooling fan relay position—typically in the engine bay fuse/relay box or mounted on/near the radiator shroud depending on model.
- Disconnect: Unplug the electrical connector and any retaining clip or screw securing the relay and harness stub.
- Replace: Fit the replacement relay making sure the connector is fully seated and any seals are intact. Secure mounting hardware as originally fitted.
- Test: Reconnect the battery, start the engine and verify fan operation at idle and under simulated load (AC on/high coolant temperature). Check for fault codes if applicable.
Installation Recommendations
- Always Disconnect Battery: Remove the negative battery cable before removal and installation to avoid short circuits and protect vehicle electronics.
- Inspect Wiring: Check connectors and wiring for corrosion, heat damage or broken strands; replace or repair damaged wiring to prevent repeated failures.
- Secure Mounting: Ensure the relay and harness stub are routed clear of moving parts and hot surfaces, and that any rubber grommets or seals are in good condition to prevent moisture ingress.
- Verify Operation: After installation, confirm proper fan switching and scan for related fault codes with diagnostic equipment if available.
Most Common Failure Reasons
- Heat And Vibration: Prolonged exposure to engine bay heat and vibration can cause contact wear, internal welding, or connector degradation.
- Corrosion And Moisture: Water ingress and corrosion at the connector or relay terminals lead to increased resistance and intermittent operation.
- Electrical Overload: Faulty fan motors, short circuits, or poor earth connections can overload the relay contacts and shorten lifespan.
- Aging: Like all electromechanical relays, contacts wear over time and switching performance degrades after many cycles.
Suitable for professional workshops and competent DIY mechanics looking for a direct replacement relay assembly for Citroën and Peugeot cooling fan systems. Use the listed product codes to confirm fitment with vehicle parts diagrams or parts lists before ordering.
