Prevent Coolant Leaks & Protect Your Engine from Overheating

Coolant loss or overheating issues?
A cracked or leaking coolant expansion tank hose can cause coolant seepage, pressure loss, and unstable engine temperatures — potentially leading to expensive engine damage if ignored.

This OEM-spec coolant reservoir hose is designed to restore reliable coolant circulation and maintain proper cooling system pressure.

Product Overview

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

Compatible Vehicles

Audi

• A6
• S6

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

Specifications

• OE Numbers: 4K0121081CQ / 4K0121081BT
• 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 system 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 around reservoir
• Engine overheating

Installation Notes

Professional installation recommended.
Inspect coolant reservoir, hose clamps, and cooling system connectors during replacement for best results.

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 leads to overheating and costly engine repairs.