Dorman 902-844 Engine Coolant Thermostat Housing - Upper

Overview of Dorman Engine Coolant Thermostat Housing 902-844

The Dorman 902-844 engine coolant thermostat housing is designed for reliable cooling system performance in select Ford and Mercury vehicles. This thermostat housing is engineered to meet the specific requirements of models such as the Ford Explorer, Explorer Sport, Explorer Sport Trac, Mountaineer, and Ranger.

• Constructed from durable black plastic material
• Includes an O-ring for a secure seal
• Features a 1-inch outlet port diameter
• Three mounting holes with 0.25-inch diameter each
• Housing neck angled at 45 degrees from the base
• Does not include thermostat, gasket, bolts, or air vent

Detailed Product Description

The Dorman 902-844 thermostat housing is made from high-quality plastic designed to withstand engine heat and pressure while maintaining a secure coolant flow path. Its black finish provides corrosion resistance and durability. The housing features a 45-degree neck angle from the base, allowing proper coolant hose alignment for the Ford Explorer and Mercury Mountaineer cooling systems. The 1-inch outlet port diameter ensures compatibility with factory coolant hoses. Three mounting holes, each 0.25 inches in diameter, provide a stable and secure fitment on the engine block. This part includes an O-ring to help prevent leaks but does not come with a thermostat, gasket, bolts, or an air vent (bleeder valve).

Compatible Vehicles and Applications

This thermostat housing is compatible with the following vehicles:

• Ford Explorer (various model years)
• Ford Explorer Sport
• Ford Explorer Sport Trac
• Mercury Mountaineer
• Ford Ranger

It is designed to replace the original thermostat housing in these models, ensuring proper coolant flow and engine temperature regulation.

Common Issues Addressed by This Thermostat Housing

• Coolant leaks caused by cracked or damaged thermostat housing
• Overheating due to faulty or warped housing affecting thermostat operation
• Loose or improper hose connections from worn outlet ports
• Corrosion or degradation of original plastic housing
• Replacement of missing or damaged O-ring seals

Installation Notes and Tips

• Ensure the engine is cool before beginning installation to avoid burns
• Remove old thermostat housing carefully to prevent damage to mounting surfaces
• Replace the O-ring included with the new housing to ensure a proper seal
• Do not reuse old bolts; use appropriate hardware for secure mounting
• Check coolant levels and bleed air from the system after installation

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The 902-844 thermostat housing undergoes quality inspections to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Refer to Dorman’s official documentation for exact warranty terms.