Heater / Blower Resistor - DENSO - DRS21009
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eBayBlower resistor DRS21009 DENSO for CITROËN C4 GRAND PICASSO II C4 PICASSO II
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Product Information
Full details
The DENSO DRS21009 Heater / Blower Resistor is an essential automotive component designed for vehicle owners experiencing inconsistent fan speeds in their HVAC systems. Engineered to meet or exceed original equipment (OE) specifications, this part restores proper control to your cabin heating and cooling airflow. While it is a high-quality, reliable replacement part, users should note that improper installation or existing electrical faults in the blower motor can affect its longevity, so verifying vehicle fitment and checking the overall blower motor health before installation is recommended.
All features
| Model Part Number | DRS21009 |
|---|---|
| Brand | DENSO |
Extended Product Information
FAQs
How do I know if I need a new blower resistor?
If your heater fan only works on the highest setting or does not work at all, the resistor is often the failed component.
Is this a genuine DENSO part?
Yes, this is a genuine DENSO part (MPN: DRS21009) designed to meet OE specifications.
Do I need special tools for installation?
Generally, only basic hand tools like a screwdriver or socket set are required to remove the access panels and mounting screws.
Can a bad blower motor damage my new resistor?
Yes. If the blower motor is worn out, it may draw too much current, causing the new resistor to overheat and fail.
Where is the blower resistor located?
It is typically located in the HVAC ducting under the passenger side dashboard, near the blower motor assembly.
Troubleshooting
Fan only works on high speed
The thermal fuse in the resistor is likely blown; replace the resistor unit.
Fan does not work on any speed
Check the blower motor fuse, the blower motor itself, and the wiring harness before assuming the resistor is the fault.
New resistor fails shortly after installation
Inspect the blower motor for high current draw or mechanical stiffness which can cause the resistor to overheat.
Pros and Cons
Pros
- Meets or exceeds original equipment specifications
- High-quality Japanese engineering for reliable performance
- Direct fit ensures easier installation
- Restores full control of HVAC fan speeds
Cons
- Requires proper verification of vehicle fitment before purchase
- Does not resolve issues caused by a seized blower motor
- Installation may require accessing tight spaces under the dashboard
Setup, Compatibility & Care
Before beginning installation, ensure the vehicle's ignition is off and the battery is disconnected for safety. Access typically requires removing panels under the passenger side glove box. Because this part is electronic, avoid touching the resistor coils with bare hands, as skin oils can cause localized hotspots. Always confirm the part number against your vehicle's specific make and model using a catalog or VIN decoder. If the original resistor failed due to an electrical short, it is highly recommended to inspect the blower motor for debris or mechanical resistance before installing the new DENSO unit, as a failing motor can prematurely destroy a new resistor.