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4M0121081CN Engine Coolant Overflow Hose Fits Q7 Q8 Touareg 2016-2025
| MOQ: | 10 Pieces |
| Price: | USD 2.70-5.40 / Piece |
| Standard Packaging: | Neutral packaging |
| Delivery Period: | 10 |
| Payment Method: | T/T,L/C,D/P,D/A,PayPal |
| Supply Capacity: | 50000 Pieces per Month |
Engine Coolant Overflow Hose Q7 Q8
,Rubber Coolant Hose Touareg 2016-2025
,4M0121081CN Overflow Hose Replacement
Product Highlight: This engine coolant overflow hose is a direct-fit replacement that restores proper coolant circulation between the expansion tank and the engine cooling circuit. Manufactured to original equipment standards, this reinforced rubber hose ensures reliable coolant flow and prevents overheating caused by a cracked or leaking original pipe.
OEM Number: 4M0121081CN (also referenced as 4M0 121 081 CN)
Dimensions: Standard OEM specification; reinforced composite rubber with fiber braiding.
OEM Standard Dimensions: Meets original equipment dimensional and fitment requirements.
Vehicle Adaptability: Compatible with select models listed in Section 4.
Make: N/A
Model Years: 2016–2025
Applicable Models: Q7 (4M), Q8, Touareg (CR)
Product Name: Engine Coolant Overflow Hose / Vent Line / Expansion Tank Pipe
Quality: OEM-grade construction; available in Genuine OE and premium aftermarket variants (Gates, Bapmic, TCRB)
| Parameter | Specification |
|---|---|
| Component | Engine Coolant Overflow Hose / Vent Line |
| Position | Expansion tank to coolant circuit |
| Material | Reinforced composite rubber with fiber braiding |
| Function | Coolant return / venting |
| Condition | New, OEM replacement |
Reliable Coolant Flow: Connects the expansion tank to the main cooling circuit, ensuring proper coolant return and venting for 3.0L V6 engines.
OE Direct Fit: Precision-engineered to factory specifications for direct installation with original mounting points. No cutting or modification required.
Durable Construction: Made from thickened composite rubber with embedded fiber reinforcement, offering excellent high-temperature resistance and anti-cracking performance. The special inner lining resists long-term antifreeze erosion.
Failure Symptoms: Coolant leaks, low coolant levels, overheating, or visible cracks and swelling in the hose.
Wide Compatibility: Fits Q7, Q8, and Touareg models with 3.0L V6 engines from 2016 onwards.
| Model | Chassis / Engine | Years |
|---|---|---|
| Q7 | 4M / 3.0L V6 MHEV | 2016–2025 |
| Q8 | 4M / 3.0L V6 MHEV | 2019–2025 |
| Touareg | CR / 3.0L V6 | 2018–2025 |
Verify VIN and specific engine variant before ordering. Compatible with 2.0L and 3.0L engine applications depending on market.
Q1: What are signs my coolant overflow hose needs replacement?
Coolant leaks under the vehicle, low coolant warning lights, engine overheating, or visible cracks and brittleness in the rubber hose.
Q2: Is 4M0121081CN a genuine OEM part?
Yes, this is a Genuine OEM part manufactured to original equipment specifications. It is the direct replacement for the factory-installed hose.
Q3: Is professional installation required?
Cooling system hose replacement involves draining and bleeding the coolant system. Professional installation is recommended to ensure proper sealing and to prevent air pockets that can cause overheating.
