Airtex AW6738 Water Pump Assembly

Technical engineering specifications and operating parameters for the Airtex AW6738 engine water pump. This coolant pump assembly features a sturdy metal casing, wear-resistant impeller, and high-quality sealed bearings designed to withstand high temperatures and coolant erosion. The unit incorporates heavy-duty unitized bearings, pressed-on hubs, precision machined housings, and unitized seals with optimal impeller clearance. Each pump is 100% factory tested to assure quality and prevent engine overheating. Direct-fit replacement for GM OEM part numbers 12692045, 12656810, 12683012, and 251-821. Material composition includes aluminum or cast iron housing with steel shaft and polymer impeller. Component construction follows robotic assembly processes for both OE and aftermarket production. OEM cross-reference interchange includes ACDelco 251-821, GM 12692045, GMB 130-3020, US Motor Works US8918, and Airtex AW6738.