Four Seasons 86326 Engine Coolant Thermostat Housing

Thermostat Housing for BMW Cooling Repair

Four Seasons 86326 is an integrated engine coolant thermostat housing built for select BMW applications. It combines the thermostat and housing in one plastic assembly for a direct replacement on 2011-2012 BMW 740i, 2011-2012 BMW 740Li, and 2011 BMW 528i.

Four Seasons Thermostat Housing line parts are engineered and tested for dependable operation in cooling system service. This 86326 thermostat housing follows that product-line focus with a fitment-specific design for BMW cooling repairs.

Key Features

• Integrated thermostat housing design
• Thermostat included
• Plastic construction
• 1.51 in inlet diameter
• 5.000 in overall height
• 0.39 in mounting flange width
• No gasket or seal included

Detailed Description

Four Seasons 86326 is an engine coolant thermostat housing for BMW 740i, BMW 740Li, and BMW 528i applications listed above. The integrated design places the thermostat within the housing, helping simplify cooling system service on the specified vehicles. This part cross-references Gates 34789 for the same application.

Use this Four Seasons thermostat housing when replacing a worn, cracked, or leaking coolant housing on a 2011-2012 BMW 740i, 2011-2012 BMW 740Li, or 2011 BMW 528i. The plastic housing and included thermostat are matched to the listed fitment, and the part number 86326 is the reference to verify before ordering.

Common Issues This Part May Address

• Coolant leaks at the thermostat housing
• Engine temperature fluctuations from a failing thermostat
• Cracked or heat-aged plastic housing
• Cooling system service on BMW 740i, BMW 740Li, or BMW 528i
• Replacement of an integrated thermostat housing assembly

Installation Notes and Tips

Confirm the vehicle year, model, and engine cooling configuration before installation. Because no gasket or seal is included, verify the required sealing components for the application before beginning service. Inspect the mating surfaces, coolant hoses, and nearby plastic fittings for wear or damage while the cooling system is open.

For best results, drain coolant as needed, clean the mounting surface thoroughly, and refill and bleed the system according to BMW service procedures after installation of Four Seasons 86326.

Quality Assurance

Four Seasons states that its products are engineered and tested for years of trouble-free operation, backed by more than 50 years of mobile A/C experience. That product-development background supports the fitment-focused design of this thermostat housing for BMW cooling system repair.