Four Seasons 85959 Engine Coolant Thermostat Housing

Overview of Four Seasons Thermostat Housing 85959

The Four Seasons Thermostat Housing 85959 is designed specifically for BMW 540i, 740i, and 740iL models. This integrated thermostat housing combines durable aluminum construction with a pre-installed thermostat and gasket, ensuring reliable engine coolant management.

• Constructed from high-quality aluminum for durability and heat resistance
• Includes integrated thermostat and gasket for a complete replacement
• Designed with 4 mounting holes and precise bolt hole spacing of 2.68 inches
• Features inlet port diameter of 1.334 inches and outlet port diameter of 42.000 mm
• Flange thickness of 0.409 inches and overall height of 2.427 inches
• Meets or exceeds OEM specifications for BMW 540i, 740i, and 740iL

Detailed Product Description

The Four Seasons Thermostat Housing 85959 is an integrated thermostat housing engineered to maintain optimal engine temperature in select BMW models. Made from aluminum, this housing offers excellent thermal conductivity and corrosion resistance, which is critical for engine coolant components. The housing includes a pre-installed thermostat and gasket, simplifying installation and ensuring a proper seal to prevent leaks. With four mounting holes and a bolt hole center-to-center distance of 2.68 inches, it aligns precisely with factory specifications. The inlet port diameter measures 1.334 inches, while the outlet port diameter is 42.000 mm, designed to match the coolant flow requirements of BMW 540i, 740i, and 740iL engines. The flange thickness of 0.409 inches and overall height of 2.427 inches contribute to a secure fit and reliable performance.

About the Four Seasons Thermostat Housing Product Line

The Four Seasons Thermostat Housing product line focuses on providing integrated thermostat housings that meet or exceed OEM standards. This line is engineered to deliver reliable engine temperature regulation by combining the thermostat and housing into a single unit. The 85959 model exemplifies this approach by including all necessary components such as the thermostat and gasket, reducing installation complexity and ensuring compatibility with specific vehicle models like the BMW 540i, 740i, and 740iL.

Common Applications and Issues Addressed

• Replacement of worn or damaged thermostat housings in BMW 540i, 740i, and 740iL
• Resolving coolant leaks caused by cracked or corroded housings
• Addressing engine overheating due to faulty thermostat operation
• Improving coolant flow and temperature regulation with OEM-quality parts
• Preventing engine damage related to improper coolant circulation

Installation Notes and Tips

When installing the Four Seasons Thermostat Housing 85959, ensure the engine is cool before beginning work. Remove the old thermostat housing carefully to avoid damaging surrounding components. Verify that the gasket is properly seated to prevent leaks. Torque mounting bolts to manufacturer specifications, using the four mounting holes and bolt hole spacing of 2.68 inches as a guide. Double-check coolant levels and system pressure after installation to confirm proper operation.

Quality Assurance and Warranty

This thermostat housing meets or exceeds OEM standards for fit, form, and function on BMW 540i, 740i, and 740iL models. Manufactured from durable aluminum, it is designed to withstand the thermal and mechanical stresses of engine coolant systems. The product includes a gasket and thermostat to ensure a complete and reliable replacement. Warranty coverage details should be confirmed with the supplier or manufacturer.