Dorman 902-2003 Engine Coolant Thermostat Housing

Reliable Engine Coolant Thermostat Housing for Chevrolet and GMC Vehicles

The Dorman 902-2003 engine coolant thermostat housing is designed to provide a durable and precise fit for select Chevrolet, GMC, and Oldsmobile models. Constructed from metal with a natural finish, this thermostat housing ensures proper coolant flow and temperature regulation for your vehicle's engine.

• Durable metal construction with natural color finish
• Includes gasket for secure sealing
• Outlet port diameter of 1.188 inches for accurate coolant flow
• Equipped with an air vent (bleeder valve) to prevent air pockets
• Two mounting holes with 0.313-inch diameter for stable installation
• Housing neck angle of 75 degrees for precise fitment
• Compatible with Chevrolet, GMC, and Oldsmobile models including Astro, Bravada, C10, S10 Blazer, Jimmy, and more

Product Details and Specifications

The Dorman 902-2003 thermostat housing is engineered to meet the exact specifications required by various Chevrolet, GMC, and Oldsmobile vehicles. Its metal construction offers strength and resistance to heat and corrosion, while the included gasket ensures a tight seal to prevent coolant leaks. The housing features a 1.188-inch outlet port diameter and a 75-degree neck angle, designed to match OEM configurations. Additionally, the built-in air vent (bleeder valve) helps eliminate trapped air in the cooling system, improving overall engine performance. This thermostat housing does not include the thermostat or mounting bolts, so those components must be sourced separately.

Compatible Vehicles and Applications

This engine coolant thermostat housing is compatible with a wide range of Chevrolet, GMC, and Oldsmobile models, including but not limited to:

• Chevrolet Astro, S10, S10 Blazer, C10, C20, C30, C1500, C2500, C3500
• GMC Jimmy, Bravada, G10, G20, G30, K10, K20, K30, K1500, K2500, K3500
• Oldsmobile models such as Safari and Sonoma
• Heavy-duty and van models like P30, P3500, R10, R20, R30, R1500, R2500, R3500, V10, V20, V30, V1500, V2500, V3500

Common Issues Addressed by This Thermostat Housing

• Coolant leaks caused by cracked or damaged thermostat housings
• Overheating due to improper coolant flow or air trapped in the cooling system
• Corrosion and wear from prolonged exposure to engine heat and coolant
• Loose or damaged mounting points leading to coolant loss
• Failure of the air vent (bleeder valve) causing air pockets and inefficient cooling

Installation Notes and Tips

When installing the Dorman 902-2003 thermostat housing, ensure the mating surfaces are clean and free of old gasket material. Use the included gasket to achieve a proper seal and prevent leaks. Since mounting bolts are not included, use OEM or equivalent bolts with the correct specifications. Verify the housing neck angle and outlet port diameter match your vehicle’s requirements. Bleed the cooling system properly to remove air pockets using the built-in air vent. This housing is designed for use without O-rings.

Quality Assurance and Warranty

Dorman manufactures this thermostat housing to meet or exceed OEM standards for fit, form, and function. The metal construction provides durability and resistance to corrosion and heat. The product includes a gasket to ensure a reliable seal. While thermostat and bolts are not included, the housing is engineered for straightforward installation and long-term service. Warranty details are available through Dorman and typically cover defects in material and workmanship.