Description
Fan Motor Resistor / Regulator by VALEO for Citroën and Peugeot. Fits Citroën C1, Peugeot 107 and Toyota Aygo. Resistive HVAC control.
This VALEO blower motor resistor is a direct-fit regulator used in the heating, ventilation and air conditioning (HVAC) system to control blower fan speeds on Citroën C1, Peugeot 107 and Toyota Aygo models. Designed for professional workshops and experienced DIY mechanics, this resistive type regulator provides reliable step control of the blower motor for correct cabin airflow at different fan settings.
Key Benefits
– Direct replacement for original equipment VALEO units, simple swap-in design.
– Restores full range of blower speeds when the resistor has failed or a single fan speed is lost.
– Robust construction suitable for typical automotive HVAC environments.
When And Why You Replace It
Blower motor resistors typically fail gradually or suddenly, commonly presenting as loss of one or more fan speed steps or complete failure of the blower. Causes include overheated resistor tracks, connector corrosion, debris or water ingress into the blower housing, and excessive current draw from a worn blower motor. Replacement is recommended when fan speed control is inconsistent or when only the highest speed works (a common symptom of a failed resistor).
Replacement Procedure (Overview)
Basic replacement steps for a trained mechanic or competent DIYer familiar with vehicle electrics:
- Disconnect the negative battery terminal before starting to avoid short circuits and protect electronics.
- Access the blower housing (typically under the glovebox or passenger-side dash on the listed models) and remove necessary trim panels.
- Unplug the electrical connector from the resistor and remove the mounting screws or clips securing the resistor to the housing.
- Fit the new resistor, secure mechanically, reconnect the electrical plug and reassemble the trim.
- Reconnect the battery and verify all blower speed settings function correctly.
Note: Clean connector pins and the blower motor inlet to reduce the risk of early re-failure. Avoid touching resistor PCB tracks directly to prevent damage.
Most Common Failure Causes
- Overheating of resistor elements due to high current draw from a failing blower motor.
- Corrosion or poor contact at electrical connectors causing increased resistance and heat.
- Debris or water ingress into the blower housing damaging resistor terminals or tracks.
- Thermal cycling and age-related deterioration of resistor components.
Technical Information
- Manufacturer: Valeo
- Model: Citroën C1; Peugeot 107; Toyota Aygo
- Product Codes: 6445ZA
- Other Numbers: Not Specified
- Type: Resistive Blower Motor Regulator
- Function: Controls blower fan speed steps for HVAC system
Installation Recommendations
– Always disconnect the battery before starting work to protect vehicle electronics.
– Inspect and, if necessary, service the blower motor and housing when replacing the resistor — a faulty blower often causes resistor failure.
– Ensure connectors are clean and properly seated; apply dielectric grease if appropriate to prevent future corrosion.
– Test all fan speed settings after installation to confirm correct operation.
Suitability And Fitment Notes
This resistor is intended as a fitment for Citroën C1, Peugeot 107 and Toyota Aygo models that use a resistive blower speed controller. Confirm vehicle model and heater unit layout before purchase if you are matching parts visually.
