Four Seasons 86307 Engine Coolant Thermostat Housing

Integrated Thermostat Housing for Mercedes-Benz

Four Seasons Thermostat Housing 86307 is an integrated engine coolant thermostat housing built from plastic and supplied with the thermostat and gasket or seal included. It meets or exceeds OEM requirements and is specified for Mercedes-Benz cooling system service where the thermostat and housing are serviced together.

Compatible with Mercedes-Benz E200, E300, E350, GLC300, SLC300, E250, GLC350e, C300, GLC250, and SLK300 applications, this Four Seasons thermostat housing 86307 supports direct replacement needs across multiple model years. The integrated design helps streamline coolant system repair on Mercedes-Benz E-Class, C-Class, GLC-Class, and related platforms.

• Brand: Four Seasons Thermostat Housing
• Part Number: 86307
• Integrated thermostat housing with thermostat included
• Gasket or seal included
• Plastic construction
• Meets or exceeds OEM specifications
• Engine coolant components for cooling system service
• Cross-reference: Focus Auto Parts 86307, PRT 817137

Product Details

This engine coolant thermostat housing is built as an integrated assembly with a 1.51 in inlet port diameter, 0.57 in flange thickness, 3.45 in bolt hole center-to-center spacing, and 8.5 in overall height. The housing is designed for vehicles that use a thermostat and housing combined into one service part, helping maintain proper coolant flow control in the engine cooling system. Four Seasons 86307 is a direct-fit style replacement for Mercedes-Benz E200, E300, E350, GLC300, and related applications listed below.

What This Part Helps Address

• Coolant leaks at the thermostat housing
• Cracked or warped plastic housing surfaces
• Faulty thermostat operation affecting engine temperature control
• Coolant loss from a deteriorated gasket or seal
• Cooling system service on Mercedes-Benz E-Class, C-Class, and GLC-Class models

Installation Notes

Verify engine code and cooling system configuration before installation, since thermostat housing applications can vary by model year and engine package. Inspect mating surfaces, flush contaminated coolant if needed, and confirm the inlet port, bolt spacing, and housing style match the original part before assembly. Use the listed fitment to confirm application on Mercedes-Benz E200, E300, E350, GLC300, SLC300, E250, GLC350e, C300, GLC250, and SLK300 vehicles.

• Fits 2017-2020 Mercedes-Benz E200, N/A
• Fits 2017-2020 Mercedes-Benz E300, N/A
• Fits 2020 Mercedes-Benz E350, N/A
• Fits 2016-2020 Mercedes-Benz GLC300, N/A
• Fits 2017-2020 Mercedes-Benz SLC300, N/A
• Fits 2017-2019 Mercedes-Benz E250, N/A
• Fits 2019 Mercedes-Benz GLC350e, N/A
• Fits 2016-2017 Mercedes-Benz C300, N/A
• Fits 2017 Mercedes-Benz GLC250, N/A
• Fits 2016 Mercedes-Benz SLK300, N/A

Quality Assurance

Four Seasons manufactures this thermostat housing as an OEM-specification replacement component for cooling system repair. The part is built to meet or exceed OEM requirements for the listed Mercedes-Benz applications and is supported by the brand’s engine coolant components lineup.