Four Seasons 86105 Engine Coolant Thermostat Housing

Thermostat Housing for Mercedes-Benz Cooling Systems

Four Seasons 86105 is an integrated engine coolant thermostat housing built for Mercedes-Benz cooling system service. It combines the thermostat housing and thermostat in one aluminum assembly, with the gasket or seal included for a cleaner replacement on select Sprinter, E-Class, M-Class, GL-Class, and R-Class applications.

This Four Seasons Thermostat Housing line focuses on direct-fit engine coolant components that meet or exceed OEM requirements. Part number 86105 is a practical choice when servicing a Mercedes-Benz Sprinter 2500 or Sprinter 3500 thermostat housing, or when replacing the thermostat housing on compatible E350, ML350, and GL350 models.

Key Features

• Integrated thermostat housing design
• Aluminum construction for cooling system durability
• Thermostat included
• Gasket or seal included
• Meets or exceeds OEM specifications
• Inlet port diameter: 1.73 in.
• Bolt hole center to bolt hole center: 2.25 in.
• Flange thickness: 0.38 in.
• Overall height: 3.19 in.

Detailed Description

Four Seasons 86105 is an engine coolant thermostat housing designed as an integrated thermostat housing assembly for Mercedes-Benz cooling system repair. The aluminum body helps provide a stable mounting surface, while the included thermostat and seal support a complete housing replacement on the applications listed below. This part cross-references Gates 34821 for the same application.

Compatible With 2010-2018 Mercedes-Benz Sprinter 2500, N/A; 2010-2018 Mercedes-Benz Sprinter 3500, N/A; 2011-2013 Mercedes-Benz E350, N/A; 2010-2013 Mercedes-Benz R350, N/A; 2010-2012 Mercedes-Benz GL350, N/A; 2010-2011 Mercedes-Benz ML350, N/A; 2007-2009 Mercedes-Benz E280, N/A; 2007-2009 Mercedes-Benz E320, N/A; 2007-2009 Mercedes-Benz GL320, N/A; 2007-2009 Mercedes-Benz ML320, N/A; and 2007-2009 Mercedes-Benz R320, N/A. Additional coverage includes 2018 Mercedes-Benz Sprinter, Sprinter 3500XD, and 2008-2011 Mercedes-Benz E300 applications as listed in the fitment data.

Common Repair Uses

• Replacing a leaking thermostat housing on a Mercedes-Benz Sprinter
• Restoring proper coolant flow control on E350, ML350, or GL350 models
• Addressing thermostat-related overheating or slow warm-up conditions
• Repairing cracked or warped aluminum housing surfaces
• Correcting coolant seepage at the housing or seal interface

Installation Notes and Tips

Verify the inlet port diameter, bolt spacing, flange thickness, and overall height against the original part before installation. Clean the mating surfaces thoroughly, inspect adjacent coolant hoses and connectors, and refill the cooling system with the correct Mercedes-Benz-approved coolant after service. Because this is an integrated thermostat housing, confirm the thermostat orientation and housing alignment during installation.

Quality Assurance

Four Seasons 86105 is listed as meeting or exceeding OEM requirements for the specified applications. The Four Seasons Thermostat Housing line is built for direct replacement use in engine coolant service, with fitment coverage for Mercedes-Benz Sprinter, E-Class, M-Class, GL-Class, and R-Class models.