Four Seasons 86099 Engine Coolant Thermostat Housing

Thermostat Housing for Mercedes-Benz Cooling Repair

Four Seasons 86099 is an integrated engine coolant thermostat housing built for direct replacement in select Mercedes-Benz cooling systems. It combines the thermostat housing and thermostat in one aluminum assembly, with the gasket or seal included for a cleaner service job.

Compatible with Mercedes-Benz C220, C230, and SLK230 applications, this Four Seasons thermostat housing is made to meet or exceed OEM requirements and supports accurate coolant flow control in the engine cooling circuit.

Key Features

• Integrated thermostat housing design with thermostat included
• Aluminum construction for corrosion resistance and durability
• Gasket or seal included
• Meets or exceeds OEM specifications
• Inlet port diameter: 1.57 in.
• Bolt hole center to bolt hole center: 2.4 in.
• Flange thickness: 0.43 in.
• Overall height: 3.71 in.

Product Details

Four Seasons Thermostat Housing 86099 is an engine coolant component designed for precise thermostat mounting and coolant routing. The integrated thermostat housing style helps restore proper operating temperature control in Mercedes-Benz C220, Mercedes-Benz C230, and Mercedes-Benz SLK230 cooling systems. This part cross-references Gates 33932 and Stant 14589 for the same application.

Common Cooling System Issues It May Address

• Coolant leaks at the thermostat housing
• Cracked or warped housing surfaces
• Improper engine warm-up or temperature regulation
• Thermostat service needs in the coolant outlet assembly
• Seal failure at the housing-to-engine connection

Installation Notes and Tips

• Verify the inlet port diameter, bolt spacing, and overall height before installation.
• Inspect the mating surface and clean away old gasket material before assembly.
• Replace damaged coolant hoses or clamps if wear is present.
• Refill and bleed the cooling system according to Mercedes-Benz service procedures after installation.
• Confirm fitment for 1994-1997 Mercedes-Benz C220, 1996-2000 Mercedes-Benz C230, and 1998-2004 Mercedes-Benz SLK230 before ordering.

Quality Assurance

Four Seasons 86099 is engineered to meet or exceed OEM specifications and is built as a direct-fit replacement for the listed Mercedes-Benz applications. The aluminum housing and included seal support dependable service in cooling system repairs.