Vaico V10-5109 Engine Coolant Hose

Engine Coolant Hose for Audi and Volkswagen

VAICO V10-5109 is an engine coolant hose for the pipe to throttle body connection on select Audi and Volkswagen models. Built to match the OE reference 078 121 188 B, it supports the cooling circuit layout used on 2001 Audi A4, A4 Quattro, A6, and A6 Quattro, plus 2001-2005 Volkswagen Passat applications.

Key Features

• Engine coolant hose for the throttle body coolant pipe connection
• OE reference: 078 121 188 B
• Dimensions: 118 mm length, 58 mm width, 22 mm height
• Lightweight construction at 0.025 kg
• VAICO part number V10-5109 for direct catalog lookup
• Fits select Audi A4, Audi A4 Quattro, Audi A6, Audi A6 Quattro, and Volkswagen Passat applications

Detailed Description

VAICO V10-5109 is an aftermarket engine coolant hose made for the pipe to throttle body routing used on specific Audi and Volkswagen vehicles. The hose dimensions and OE cross-reference support accurate replacement of the original coolant line identified by 078 121 188 B. For buyers searching for an Audi A4 coolant hose, Volkswagen Passat throttle body hose, or an OE-style replacement for Audi A6 cooling system service, this part number provides a direct catalog match.

VAICO is the brand line used for this replacement component, and V10-5109 is the identifying part number for ordering and fitment verification. The compact size and low weight make it suitable for cooling system repairs where the original hose has aged, cracked, or begun to leak.

Common Repair Uses

• Coolant seepage at the throttle body pipe connection
• Cracked or hardened hose material from heat cycling
• Loss of coolant from a damaged engine coolant hose
• Cooling system service on a 2001 Audi A4 or A4 Quattro
• Replacement on a 2001 Audi A6, A6 Quattro, or 2001-2005 Volkswagen Passat

Installation Notes and Tips

Verify the OE number 078 121 188 B and compare the hose dimensions before installation. Confirm the routing at the pipe to throttle body connection and inspect adjoining clamps, pipes, and seals for wear before reassembly. Fitment includes 2001 Audi A4, 2001 Audi A4 Quattro, 2001 Audi A6, 2001 Audi A6 Quattro, and 2001-2005 Volkswagen Passat applications.

Quality Assurance

VAICO V10-5109 is cataloged as an aftermarket replacement built to match the listed OE application and reference number for accurate fitment on the specified Audi and Volkswagen vehicles.