Prevent Coolant Leaks & Maintain Proper Engine Cooling

Coolant leaks or low coolant warnings?
A worn or cracked coolant expansion tank hose can lead to coolant loss, unstable cooling system pressure, and engine overheating issues.

This OEM-spec coolant reservoir hose is designed to restore reliable coolant flow and maintain proper cooling system performance for Audi vehicles.

Product Overview

High-quality replacement coolant expansion tank hose for Audi A4 and A5 models.
Manufactured to OE specifications for secure fitment, leak-free sealing, and long-lasting durability under high engine temperatures and pressure.

Compatible Vehicles

Audi

• A4
• A5

⚠️ Please verify compatibility using your VIN or OEM part number before purchase.

Specifications

• OE Numbers: 8W0121081BL / 8W0121164DE
• Product Type: Coolant Expansion Tank Hose / Reservoir Hose
• Material: Reinforced heat-resistant rubber & plastic
• Installation: Direct OEM replacement — no modification required
• Package Includes:
  • 1 × Coolant Reservoir Hose

Why Choose This Part?

✅ Restores proper coolant circulation and pressure
✅ Helps prevent coolant leaks and overheating
✅ OEM-style fitment for precise installation
✅ Heat and pressure resistant construction
✅ Durable sealing performance under high temperatures
✅ Tested for durability and long service life

Common Symptoms This Fixes

• Coolant leak
• Low coolant warning light
• Coolant smell from engine bay
• Cracked coolant hose
• Coolant residue near reservoir tank
• Engine overheating

Installation Notes

Professional installation recommended.
Inspect coolant reservoir, hose clamps, and nearby cooling system fittings during replacement.

Buy with Confidence

✔ OEM Fit & Performance
✔ Quality Tested Before Shipping
✔ Fast US/EU Shipping
✔ 12-Month Warranty

Replace leaking coolant reservoir hoses before coolant loss causes overheating and costly engine repairs.