4A0121350 Viscous Fan Clutch Assembly for AUDI A4
Product: Viscous Fan Clutch Assembly
Primary OE: 4A0121350
Item code: AD01012-002
Cross-reference numbers:
4A0121350B
Brand: AUDI
Model: A4
Function: Varies torque to the engine cooling fan as thermal demand changes.
Supply: Aftermarket wholesale supply for distributors, importers and repair markets.
Fitment check: Verify OE, engine, thread or flange, fan pattern, hub depth and rotation.
Quality note: Inspection can cover bearing feel, sealing, mounting details and packing.
4A0121350 Viscous Fan Clutch Assembly for AUDI A4
This listing covers the 4A0121350 viscous fan clutch assembly referenced for AUDI A4. Yongshang Auto records it as AD01012-002 for fitment review, quotation and export traceability.
A viscous fan clutch transfers engine rotation to the cooling fan through temperature-responsive silicone fluid. It can increase fan drive as under-hood temperature rises and reduce drag when full airflow is unnecessary.
Product Technical Specifications
| Component | Viscous fan clutch assembly |
|---|---|
| Primary OE reference | 4A0121350 |
| Cross-reference numbers | 4A0121350B |
| Vehicle brand | AUDI |
| Model reference | A4 |
| Yongshang Auto SKU | AD01012-002 |
| Supply position | Aftermarket wholesale replacement |
Thermal Fan-Drive Function
The coupling regulates fan speed according to thermal demand rather than locking the fan permanently to engine speed. Correct engagement supports radiator airflow while limiting avoidable noise and power consumption.
Constant fan roar, weak airflow at idle, overheating in traffic, hub wobble or silicone-fluid leakage can indicate fan-clutch wear, although the complete cooling system should be diagnosed.
Compatibility Review Before Ordering
Confirm 4A0121350 against the original AUDI A4 clutch, then compare the input thread or flange, fan bolt pattern, hub depth, pilot diameter and rotation direction.
- Confirm the OE number and usable cross-references.
- Match vehicle model, engine, chassis and production period.
- Check drive-side thread or flange and rotation direction.
- Measure hub height, pilot diameter and fan bolt circle.
- Verify blade alignment and clearance inside the shroud.
Installation and Cooling-System Checks
Installation should be completed by a qualified technician. Follow the specified thread direction and torque procedure, inspect the fan and water-pump bearing, replace damaged hardware, and confirm that the blade rotates freely without contacting the radiator or shroud. Test the vehicle under the appropriate warm operating conditions after assembly.
Inspection and Export Preparation
Available checks can cover bearing movement, visible sealing condition, mounting geometry, thread protection, labeling and export-carton integrity.
Ordering Specification Notes
A complete purchasing file for AUDI A4 should connect 4A0121350 and AD01012-002 with engine data, hub height, mounting style, fan bolt circle and original-unit photographs. Recording these details before sample approval gives sourcing, warehouse and after-sales teams a consistent reference for future orders.
Wholesale and Procurement Information
For wholesale pricing, provide 4A0121350, SKU AD01012-002, quantity, destination and packaging preference. Separate every OE line in mixed cooling-system enquiries.
Frequently Asked Questions
How can I verify 4A0121350 for AUDI A4?
Compare the OE label, engine application, mounting thread or flange, fan pattern, hub depth and original-unit photographs.
What does a viscous fan clutch do?
It varies torque to the cooling fan according to thermal demand, helping provide airflow without permanently locking the fan to engine speed.
Can an incorrect clutch cause fan contact?
Yes. Wrong offset, mounting or bolt pattern can move the fan outside its intended clearance, so dimensions must be checked before installation.
Can I order 4A0121350 as a sample?
Sample enquiries are welcome. Send SKU AD01012-002, destination and the comparison points that must be confirmed.
What is needed for wholesale pricing?
Provide quantity, destination, packing preference and any labeling or inspection requirement together with 4A0121350.
Request a 4A0121350 Fan Clutch Quote
Contact Yongshang Auto with 4A0121350, AD01012-002, quantity and destination country for a fitment review and wholesale proposal for AUDI A4.
Fitment notice: OE and model references support identification but do not replace engine-specific catalogue checks or comparison with the original fan clutch.
