Dorman 902-2127 Engine Coolant Thermostat Housing - Upper

Overview of Dorman Engine Coolant Thermostat Housing 902-2127

The Dorman 902-2127 engine coolant thermostat housing is designed for reliable cooling system performance in Chevrolet and GMC heavy-duty trucks. Engineered from durable aluminum, this thermostat housing suits specific models including the Chevrolet Silverado 2500 HD and GMC Sierra 3500 HD.

• Constructed from corrosion-resistant aluminum for durability
• Natural aluminum finish for OEM appearance
• Compatible with Chevrolet and GMC heavy-duty trucks
• Four mounting holes with precise 4.65-inch bolt hole center spacing
• Inlet port diameter of 2 inches and outlet port diameter of 1.95 inches
• Flange thickness of 0.787 inches for secure sealing
• 90-degree housing neck angle for proper coolant flow
• Does not include thermostat, gasket, bolts, or O-rings

Detailed Product Description

The Dorman 902-2127 engine coolant thermostat housing is crafted from high-quality aluminum, providing strength and resistance to corrosion under high-temperature conditions. Its natural finish maintains the original equipment manufacturer (OEM) look, making it suitable for visible engine bay installations. The housing features a 90-degree neck angle, facilitating efficient coolant flow through the system. With four mounting holes spaced 4.65 inches apart center-to-center and a flange thickness of 0.787 inches, this housing ensures a secure and precise fit. The inlet and outlet port diameters of 2 inches and 1.95 inches respectively are designed to match factory specifications for optimal coolant circulation.

Compatible Vehicles and Applications

This thermostat housing is compatible with select Chevrolet and GMC heavy-duty trucks, including:

• Chevrolet Silverado 2500 HD, 2500 HD Classic, 3500, 3500 Classic, and 3500 HD
• GMC Sierra 2500 HD, 2500 HD Classic, 3500, 3500 Classic, and 3500 HD

It is intended for use as a replacement water outlet housing in the engine cooling system, ensuring proper thermostat operation and coolant flow.

Common Issues Addressed by This Thermostat Housing

• Coolant leaks caused by cracked or damaged thermostat housing
• Overheating due to improper coolant flow
• Corrosion and wear from prolonged exposure to engine heat and coolant
• Loose or misaligned mounting resulting in coolant seepage
• Replacement of worn or broken OEM thermostat housing components

Installation Notes and Tips

• Ensure the engine is cool before beginning installation to avoid burns
• Inspect and replace the thermostat, gasket, and O-rings separately as they are not included
• Clean the mounting surface thoroughly to ensure a proper seal
• Torque mounting bolts to manufacturer specifications to prevent leaks
• Verify hose connections match the 2-inch inlet and 1.95-inch outlet port diameters

Quality Assurance and Warranty

Dorman manufactures the 902-2127 thermostat housing to meet or exceed OEM standards for fit, form, and function. The aluminum construction offers long-lasting durability in demanding engine environments. While the product does not include a thermostat or seals, it is backed by Dorman's quality control processes. Please refer to Dorman's warranty policy for specific coverage details.