Dorman 902-5991 Engine Coolant Thermostat Housing Assembly

Engine Coolant Thermostat Housing Assembly

Dorman 902-5991 is a replacement engine coolant thermostat housing assembly built for specified Suzuki and Isuzu applications. It combines the housing, thermostat, and gasket in one OE-style service part, with an aluminum body designed to handle repeated temperature swings in the cooling system.

Compatible With 1998-2008 Suzuki Forenza, Isuzu Rodeo, Isuzu Rodeo Sport, and Isuzu Amigo applications that use a 198 degree Fahrenheit thermostat.

Key Features

• Aluminum housing with a natural finish
• Thermostat included, set to open at 198 degrees F
• Gasket included for sealing at the housing interface
• Two mounting holes and two outlet ports
• OE-style replacement for specified cooling system layouts
• Part number 902-5991 for catalog and service reference

Detailed Description

This Dorman thermostat housing assembly is engineered to match the fit and durability of the stock housing on the listed vehicles. The aluminum construction helps the housing withstand heat cycling and coolant exposure, while the included thermostat and gasket simplify service on the cooling system. For drivers servicing a Suzuki Forenza or Isuzu Rodeo cooling system, 902-5991 provides a direct replacement format for the original housing assembly.

This part cross-references Monroe Shocks & Struts 34798 for the same application.

Common Problems This Part Can Address

• Coolant leaks at the thermostat housing gasket surface
• Cracked or warped original housing from heat cycling
• Sticking thermostat that affects engine operating temperature
• Cooling system service needs on high-mileage Suzuki Forenza and Isuzu Rodeo models
• Loss of proper coolant flow control through the thermostat assembly

Installation Notes and Tips

Verify the engine configuration and thermostat housing layout before installation. Clean the mating surfaces thoroughly, inspect the coolant hoses and clamps, and refill the cooling system with the correct coolant mixture after service. Bleeding air from the system is important after thermostat housing replacement to help restore stable coolant circulation.

Quality Assurance

Dorman designs this replacement housing to match the fit and durability of the original assembly on the specified vehicles. The aluminum construction and included gasket support reliable sealing in demanding temperature conditions.