Metelli PA637 Engine Water Pump

Engine Water Pump for OE-Style Cooling Service

Metelli PA637 is a new engine water pump built for direct cooling-system replacement on select Saturn, Cadillac, and Saab applications. It features an aluminium housing, brass impeller, and included O-ring for a clean service fit on vehicles such as the Saturn L300, Cadillac CTS, and Saab 9-5.

Key Features

• New engine water pump for cooling-system repair
• Aluminium housing for durable, lightweight construction
• Brass impeller with 6 vanes for coolant circulation
• Roller/ball bearing design for smooth pump operation
• Gasket or seal included
• Package contents: water pump and O-ring
• Metelli PA637 replacement part number for catalog matching

Detailed Product Information

Metelli PA637 is engineered as an OE-style replacement water pump for a range of import and domestic vehicles, including 1994-1997 Saab 900, 1995-1997 Saab 9000, 1997-2001 Cadillac Catera, 1999-2003 Saab 9-5, 2001-2005 Saturn L300, 2001-2003 Saturn LW300, 2002-2003 Saturn Vue, 2003-2004 Cadillac CTS, and 2000 Saturn LS2 and LW2. The aluminium housing supports corrosion resistance, while the brass impeller and 56 mm impeller diameter are specified for consistent coolant movement. The bearing assembly uses a 30 mm outside diameter roller/ball bearing for stable shaft support. This part cross-references Airtex AW5079 and Dayco DP455 for the same application. PA637 is a practical match when replacing a worn pump on Saab 9-5 or Saturn L300 cooling systems.

Common Repair Reasons

• Coolant leakage from a worn pump seal or housing
• Overheating caused by reduced coolant circulation
• Noise from a failing pump bearing
• Visible corrosion or wear in the cooling system
• Service replacement during timing or cooling-system maintenance

Installation Notes

Verify engine application by year, make, and model before installation. Inspect the mounting surface, coolant passages, and O-ring sealing area for debris or damage before fitting the new pump. Flush contaminated coolant and refill with the correct specification after installation. Confirm belt alignment and check for leaks after the engine reaches operating temperature.

Quality Assurance

Metelli supplies new replacement cooling components built to cataloged application data and material specifications. PA637 is supplied as a new part with gasket or seal included, supporting a straightforward service replacement.