Four Seasons 85948 Engine Coolant Thermostat Housing

Thermostat Housing for GM 3.7L Cooling Systems

Four Seasons 85948 is an integrated engine coolant thermostat housing built for select Chevrolet Colorado, GMC Canyon, Hummer H3, and Hummer H3T applications. It combines the thermostat housing and thermostat in one aluminum assembly, with a gasket or seal included for service replacement.

The Four Seasons Thermostat Housing line focuses on direct-fit cooling system components for vehicles that need a complete thermostat housing service part. This Four Seasons 85948 assembly is made to meet or exceed OEM requirements and is specified with an integrated thermostat design for the listed applications.

Key Features

• Aluminum thermostat housing construction
• Integrated thermostat housing design with thermostat included
• Gasket or seal included
• Outlet port diameter: 31.000
• Inlet port diameter: 1.250
• Flange thickness: 0.375
• Overall height: 5.750 in.
• Meets or exceeds OEM specifications

Detailed Description

This engine coolant thermostat housing is built for cooling system service where the housing and thermostat are serviced together. The aluminum body provides a durable replacement format, while the integrated thermostat layout supports a clean, direct replacement for the original assembly. Four Seasons 85948 is listed for 2007-2012 Chevrolet Colorado, 2007-2012 GMC Canyon, 2007-2010 Hummer H3, and 2009-2010 Hummer H3T. If you are searching for a thermostat housing for a Chevrolet Colorado or GMC Canyon cooling repair, this part number is a direct reference to the correct integrated housing style.

This part cross-references Gates 34045 for the same application.

What It Is Used For

• Replacing a cracked or leaking thermostat housing
• Restoring proper coolant flow control in the engine cooling system
• Addressing thermostat-related overheating concerns
• Repairing coolant seepage at the housing or seal surface
• Servicing a worn integrated thermostat housing assembly

Installation Notes and Tips

Verify engine application and housing style before installation, especially on Chevrolet Colorado, GMC Canyon, Hummer H3, and Hummer H3T models. Inspect the mating surfaces, coolant passages, and hose connections before assembly. Use the included gasket or seal during installation and refill the cooling system with the correct coolant after service. Confirm that the outlet and inlet port dimensions match the original part before final fitment.

Quality Assurance

Four Seasons 85948 is specified as meeting or exceeding OEM requirements for the listed applications. The Four Seasons Thermostat Housing product line is built for replacement cooling system service where direct-fit dimensions and integrated thermostat construction matter.