Four Seasons 89109 Engine Auxiliary Water Pump - Left

Engine Auxiliary Water Pump Overview

This Four Seasons engine auxiliary water pump is an electric coolant pump built for select Audi and Volkswagen applications. It uses a plastic housing and a compact new-design construction to support coolant circulation in systems that require an auxiliary pump.

Part number 89109 is a direct-fit style replacement for vehicles that use an electric auxiliary coolant pump. It is listed for Audi A8 Quattro, Q5, A7 Quattro, Q7, S6, S7, S8, and S4, plus Volkswagen Touareg applications.

Key Features

• Electric coolant pump design for auxiliary cooling circuits
• Plastic housing and plastic construction
• 3-terminal pin electrical connection
• Compact dimensions for tight engine bay packaging
• New replacement part, not remanufactured

Detailed Description

Four Seasons 89109 is an engine auxiliary water pump engineered as an electric coolant pump for vehicles that rely on supplemental coolant circulation. The pump features 0.78-inch inlet and outlet connections, a 3-pin terminal layout, and a compact plastic body measuring 3.35 inches deep, 3.42 inches high, and 2.38 inches wide. This part number 89109 is used across multiple Audi and Volkswagen fitments, including Audi A8 Quattro, Q5, and Q7 applications, as well as Volkswagen Touareg models.

Four Seasons draws on more than 50 years of mobile A/C experience and tests its products for long service life. This part cross-references Dayco 89109 and Gates 41578E for the same application.

What It Is Used For

• Replacing a failed electric auxiliary coolant pump
• Restoring coolant circulation in supplemental cooling circuits
• Addressing coolant flow issues caused by pump wear or electrical failure
• Correcting leaks related to aging plastic pump housings
• Resolving warning lights or temperature control concerns tied to pump performance

Installation Notes and Tips

Verify the vehicle’s pump style, connector layout, and inlet/outlet size before installation. Fitment includes applications with N/A and left-side listings, so confirm the exact vehicle configuration against the original part. Match the electrical connector and coolant hose connections to the removed unit before final assembly.

Quality Assurance

Four Seasons states that its products are engineered and tested for years of trouble-free operation. The brand also notes more than 50 years of mobile A/C experience behind its cooling-related components.