Four Seasons 86204 Engine Coolant Thermostat Housing

Thermostat Housing for GM Cooling Systems

Four Seasons 86204 is an integrated engine coolant thermostat housing built for select Chevrolet and GMC applications. It combines the thermostat housing and thermostat in one OE-style cooling component, with a plastic housing, included gasket or seal, and a direct-fit layout for service replacement.

Compatible with 2020-2022 Chevrolet Colorado, Chevrolet Express 2500, Chevrolet Express 3500, GMC Canyon, GMC Savana 2500, and GMC Savana 3500, this thermostat housing supports accurate coolant flow control in the engine cooling system. Four Seasons 86204 meets or exceeds OEM requirements and is built to match the original-style mounting and port dimensions.

Key Features

• Integrated thermostat housing with thermostat included
• Plastic construction for OE-style replacement fitment
• Gasket or seal included for service installation
• 2 mounting holes with 2.6 in. bolt hole center spacing
• 1.500 in. inlet port diameter
• Flange thickness: 0.987 in.
• Overall height: 6.480 in.
• Meets or exceeds OEM specifications

Detailed Description

Four Seasons Thermostat Housing 86204 is an integrated thermostat housing assembly for GM cooling applications where the thermostat and housing are serviced together. The design uses a plastic housing with the thermostat included, helping restore proper coolant routing through the engine cooling system. This part cross-references PRT 817034 for the same application. Four Seasons 86204 is a direct replacement choice for Chevrolet Colorado, Chevrolet Express, GMC Canyon, and GMC Savana models listed in the fitment data.

What It Helps Address

• Coolant leaks at the thermostat housing
• Cracked or warped plastic housing surfaces
• Improper thermostat operation from a worn integrated assembly
• Cooling system temperature control issues
• Service replacement for a damaged thermostat housing on Chevrolet Colorado and GMC Canyon applications

Installation Notes and Tips

Verify engine application and housing style before installation. Confirm the inlet port diameter, mounting hole spacing, and flange dimensions against the original part. Replace the gasket or seal surface as needed, clean the mating surfaces thoroughly, and torque fasteners to the vehicle manufacturer’s specification. For 2016-2019 Chevrolet Colorado and GMC Canyon applications, the fitment notes indicate the thermostat is included in the engine coolant thermostat/water outlet assembly kit.

Quality Assurance

Four Seasons 86204 is listed as meeting or exceeding OEM requirements for the specified applications. Use the part number 86204 to confirm the correct thermostat housing for your Chevrolet or GMC cooling system service.