Metelli PA779 Engine Water Pump

Engine Water Pump with Thermostat Housing

The Metelli PA779 engine water pump is a new replacement unit built with an integrated thermostat housing for specific Audi and Volkswagen applications. It is configured with an aluminium housing, a techno-polymer impeller, and a ball/bal bearing design for cooling-system service on the 1997-2000 Audi A4, 1997-2000 Audi A4 Quattro, and 1998-2001 Volkswagen Passat.

Metelli’s With Thermostat Housing product line groups the water pump and thermostat housing configuration needed for these applications, helping match the original cooling-system layout. The PA779 is supplied as a new part and includes a gasket or seal and an O-ring for the listed application.

Key Features

• Engine water pump with thermostat housing included
• Aluminium housing construction
• Techno-polymer impeller with 7 vanes
• Ball/bal bearing design for rotating support
• Gasket or seal included
• Package contents: water pump and O-ring
• New replacement part, not remanufactured

Detailed Description

Metelli PA779 is an OE-style engine water pump assembly for cooling-system service on select Audi and Volkswagen vehicles. The integrated thermostat housing design is important for applications that use a combined pump-and-housing layout, and the aluminium housing provides a durable mounting structure. The techno-polymer impeller is sized at 63.5 mm outside diameter and uses 7 vanes to move coolant through the engine’s cooling circuit.

This part cross-references FEL-PRO 1608 and Anchor 9800 for the same application. It is listed for Fits 1997-2000 Audi A4, N/A; Fits 1997-2000 Audi A4 Quattro, N/A; and Fits 1998-2001 Volkswagen Passat, N/A. Use PA779 when replacing a worn water pump on these Audi A4, Audi A4 Quattro, and Volkswagen Passat cooling systems that require a thermostat housing.

What It Helps Address

• Coolant circulation problems caused by a worn water pump
• Leaks at the pump or housing interface
• Noisy operation from bearing wear
• Cooling-system service on engines with an integrated thermostat housing
• Impeller wear that reduces coolant flow

Installation Notes and Tips

Confirm engine code and cooling-system configuration before installation, since this part is specific to applications with a thermostat housing. Inspect the mating surfaces, replace the O-ring and gasket or seal as required, and verify that the housing and coolant passages are clean before assembly. After installation, refill and bleed the cooling system according to the vehicle service procedure to remove trapped air.

Quality Assurance

Metelli supplies this PA779 water pump as a new replacement component with the listed housing and sealing features. The part is built for the specified Audi and Volkswagen fitments and follows the application details provided for the integrated thermostat housing design.