Dorman 902-103 Engine Coolant Thermostat Housing - Lower

Reliable Engine Coolant Thermostat Housing for Chevrolet S10 and GMC Sonoma

The Dorman 902-103 engine coolant thermostat housing is designed to provide a durable and precise fit for Chevrolet S10 and GMC Sonoma models. Crafted from aluminum and steel, this thermostat housing ensures efficient heat management and long-lasting performance.

Key Features of Dorman 902-103 Thermostat Housing

• Constructed from high-quality aluminum and steel for strength and corrosion resistance
• Black and silver finish for durability and corrosion protection
• Outlet port diameter of 0.757 inches for proper coolant flow
• Includes gasket and O-rings to ensure a secure, leak-free seal
• Five mounting holes with a diameter of 0.36 inches for stable installation
• Housing neck angle set at 45 degrees to match OEM specifications
• Package contains coolant adapter pipe, housing gasket, thermostat gasket, and ignition components
• Thermostat not included

Detailed Description

The Dorman 902-103 engine coolant thermostat housing is engineered to meet the exact specifications required by Chevrolet S10 and GMC Sonoma vehicles. Its aluminum and steel construction offers a balance of lightweight durability and resistance to heat and corrosion. The housing features a 45-degree neck angle and a 0.757-inch outlet port diameter, ensuring compatibility with the vehicle’s cooling system. Included gaskets and O-rings help maintain a tight seal, preventing coolant leaks and maintaining system pressure. This part does not include the thermostat itself but provides all necessary components for a reliable housing replacement.

Common Applications and Issues Addressed

• Replacement for cracked or damaged thermostat housing
• Prevents coolant leaks caused by worn or failed seals
• Restores proper coolant flow and engine temperature regulation
• Addresses overheating issues related to faulty housing components
• Ensures secure mounting with five mounting holes matching OEM specs

Installation Notes and Tips

When installing the Dorman 902-103 thermostat housing, ensure all old gasket material is thoroughly cleaned from the mounting surface. Use the included gaskets and O-rings to achieve a proper seal. Verify the 45-degree housing neck angle aligns correctly with the vehicle’s coolant hoses. Since bolts are not included, reuse the original mounting hardware or source appropriate replacements. Double-check for leaks after installation by running the engine to operating temperature.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, providing reliable performance for Chevrolet S10 and GMC Sonoma vehicles. The 902-103 thermostat housing undergoes rigorous quality control to ensure durability and fitment accuracy. Please refer to Dorman’s warranty policy for specific coverage details.