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- Home>
- Coolant System Parts>
- One stop purchased auxiliary water tank cap 4M0 121 321E for imported Audi Q7
- Product Details
- Company Details
Product Specification
|
|
|
|
| OE NO. |
4M0 121 321E |
Packing |
Boigevis packing |
| Point Of Origin |
Guangdong, China |
Delivery Time |
3-7days |
| Quality |
High quality |
Brand |
Boigevis |
| Payment Terms |
Western Union,T/T,D/P,D/A,L/C |
Warranty |
12 Months |
| Packaging Details |
Normal |
Item Name |
auxiliary water tank cap |
| Shipping Way |
DHL UPS FEDEX EMS TNT |
Size |
Standard size |
| Car Model |
for imported Audi Q7 |
Place of Origin |
China |
| Model Number |
4M0 121 321E |
Brand Name |
Boigevis |
One stop Purchase Auxiliary Water Tank Cap 4M0 121 321E for Imported Audi Q7
This OEM-spec coolant expansion tank cap with part number 4M0 121 321E is a key pressure regulating sealing component for the cooling system of imported Audi Q7 4M chassis. The product maintains stable sales volume and continuous repeat orders in the global VAG luxury auto aftermarket, widely stocked by professional Audi maintenance workshops and cross-border auto parts wholesalers, and supports one-stop bundled procurement with expansion tanks, coolant hoses, sealing rings and complete cooling system overhaul kits.
Core Selling Points
Hot-selling sealing fitting for centralized bulk purchasing
Installed on the top of the coolant expansion tank, this cap integrates pressure relief valve and double-layer sealing rings. It withstands long-term alternating high and low temperature, coolant corrosion and vibration during vehicle operation. Internal spring fatigue, aging and hardening of rubber gaskets will cause pressure failure.
A defective auxiliary water tank cap leads to unstable internal pressure of the cooling circuit, coolant seepage at the tank mouth, frequent drop of antifreeze liquid level, slow warm-up and weak heating performance. Severe pressure loss will trigger engine high-temperature warning and accelerate aging of water pipes and expansion tank. Most buyers place unified bulk orders together with matching cooling accessories to cut procurement and logistics costs, bringing stable profit margins and low inventory pressure for distributors all year round.
100% OEM dimensional & pressure parameter matching, direct installation without modification
Manufactured strictly in accordance with Volkswagen Group original technical standards. Thread specification, sealing groove size, built-in valve opening pressure and overall outline are fully consistent with genuine 4M0121321E. Interchange OE references: 4M0121321, 4M0121321K, 4M0121321Q.
No cutting or adaptive processing is required during replacement. It can be directly screwed onto the original expansion tank opening, perfectly matching the original assembly structure and effectively shortening cooling system maintenance hours.
Applicable Vehicles & Installation Information
- Main applicable model: Imported Audi Q7 (4M chassis)
- Compatible extended models: Audi A6 C8, A7, A8 D5, Q8, VW Touareg CR7, Porsche Cayenne 9YA, Bentley Bentayga
- Matching power units: 2.0T / 3.0T gasoline & mild hybrid, 3.0T diesel engines
- Installation position: Pressure control sealing cap for engine coolant expansion reservoir
Optimized Durable Structural Design
- High-strength high-temperature resistant modified plastic housing: Resist long-term hot and cold alternation, not easy to crack or deform
- Double-layer fluororubber sealing rings: Excellent coolant resistance and anti-aging performance, maintain reliable sealing
- Precision built-in pressure relief spring and valve core: Stabilize cooling system working pressure, timely release excess pressure
- Standard original thread structure: Smooth screwing, uniform compression of sealing rings after tightening
- Complete finished unit, ready for direct replacement installation
Core Functions & Engine Protection
- Maintain constant rated pressure inside the cooling system, raise the boiling point of antifreeze and improve heat dissipation efficiency
- Form reliable sealing at the expansion tank opening to prevent coolant leakage and vapor overflow
- Automatically release excess pressure when temperature rises to avoid bulging or cracking of water pipes and expansion tank
- Prevent external air from entering the cooling loop, avoid air resistance and engine local overheating
Common Fault Phenomena That Can Be Solved
- Coolant wet marks and seepage at the mouth of auxiliary water tank
- Expansion tank liquid level drops obviously, frequent replenishment of antifreeze required
- Engine water temperature fluctuates abnormally during driving
- Air conditioner warm-up speed is slow and hot air output is unstable
- Abnormal bulging of cooling rubber pipelines under high temperature
Factory Testing & Stable Spot Supply
Each auxiliary water tank cap passes sealing tightness test, pressure opening calibration test, high-low temperature cyclic aging test and coolant immersion test before delivery, complying with IATF 16949 automotive industry quality standards.
Sufficient spot inventory supports mixed purchase with expansion tanks, coolant hoses, O-rings and complete Audi Q7 cooling system maintenance kits. Neutral packaging and private label OEM customized labeling services are available for global wholesale customers.
Company Details
Bronze Gleitlager
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Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
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Business Type:
Manufacturer
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Total Annual:
10000000-50000000
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Employee Number:
150~200
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Ecer Certification：
Verified Supplier
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