Metelli PA991 Engine Water Pump

Engine Water Pump for GM and Saab Applications

Metelli PA991 is a new engine water pump built for a wide range of GM and Saab vehicles, including Buick Enclave, Chevrolet Traverse, GMC Acadia, and Cadillac CTS applications. It uses an aluminum housing, a metal impeller, and a roller/ball bearing design to support dependable coolant circulation in the engine cooling system.

Key Features

• New engine water pump for cooling system service
• Aluminum housing for corrosion-resistant construction
• Metal impeller with 6 vanes for coolant movement
• Roller/ball bearing design for smooth pump operation
• Gasket included for installation
• Impeller outside diameter: 75.5 mm
• Bearing outside diameter: 30 mm

Detailed Product Overview

Metelli PA991 is engineered as an OE-style replacement water pump for vehicles that rely on consistent coolant flow to maintain operating temperature. The metal impeller and 6-vane design help move coolant through the engine cooling circuit, while the aluminum housing supports durability in demanding underhood conditions. This part number, PA991, is listed across multiple interchange references and is used in applications such as 2008-2016 Buick Enclave, 2009-2014 Chevrolet Traverse, and 2007-2014 GMC Acadia. This part cross-references Gates 21777 and Airtex AW5103 for the same application.

What It Helps Address

• Coolant circulation problems caused by a worn water pump
• Engine overheating from reduced pump performance
• Coolant leaks at the pump mounting surface
• Noise from a failing bearing assembly
• Service replacement for aging cooling system components

Installation Notes and Tips

Confirm engine application before installation, since this water pump is used across multiple GM and Saab platforms from 2004-2016. Replace the gasket supplied with the pump and inspect the mating surface, coolant passages, and adjacent cooling components before reassembly. Proper coolant fill and bleed procedures are important after installation to restore stable system operation. Verify fitment for your specific vehicle, such as 2010-2014 Chevrolet Equinox, 2013-2014 Cadillac ATS, or 2011 Saab 9-4X, before ordering.

Quality Assurance

Metelli PA991 is a new replacement part built with an aluminum housing, metal impeller, and bearing-supported shaft assembly for cooling-system service. The included gasket supports a complete pump replacement at the mounting point.