Four Seasons 85961 Engine Coolant Thermostat Housing

Reliable Engine Coolant Thermostat Housing for BMW and Land Rover

The Four Seasons Thermostat Housing 85961 is designed to provide precise temperature regulation for your BMW 540i, 740i, 740iL, X5, Z8, or Land Rover Range Rover. This integrated thermostat housing ensures efficient engine cooling and helps maintain optimal engine performance.

• Constructed from durable aluminum for long-lasting corrosion resistance
• Includes integrated thermostat and gasket for a complete replacement
• Compatible with BMW 540i, 740i, 740iL, X5, Z8 and Land Rover Range Rover models
• Four mounting holes with 2.54-inch bolt hole center spacing for secure installation
• Meets or exceeds OEM specifications for reliable fit and function

Product Details and Specifications

This Four Seasons Thermostat Housing 85961 features a 38.000 mm outlet port diameter and a 1.260-inch inlet port diameter, designed to match OEM dimensions precisely. The flange thickness measures 0.403 inches, and the overall height is 3.485 inches, ensuring proper fitment within the engine cooling system. The housing comes with an integrated thermostat and gasket included, simplifying installation and reducing the need for additional parts.

About the Four Seasons Thermostat Housing Product Line

The Four Seasons Thermostat Housing line focuses on providing engine coolant components that meet or exceed OEM standards. This product line is engineered to deliver reliable temperature control and durability, making it suitable for various BMW and Land Rover models. The integrated thermostat housing design streamlines replacement and maintenance tasks by combining multiple components into a single unit.

Common Applications and Issues Addressed

• Replacement of cracked or leaking thermostat housings
• Resolving engine overheating due to thermostat failure
• Fixing coolant leaks caused by worn gaskets or seals
• Restoring proper coolant flow in BMW 540i, 740i, 740iL, X5, Z8, and Land Rover Range Rover vehicles
• Improving engine temperature regulation for consistent performance

Installation Notes and Tips

Ensure the engine is cool before beginning installation to avoid injury. Remove the old thermostat housing carefully, cleaning the mounting surface thoroughly to prevent leaks. Use the included gasket and verify the four mounting holes align correctly with the 2.54-inch bolt hole centers. Tighten bolts evenly to the manufacturer's torque specifications to ensure a proper seal and avoid warping the aluminum housing.

Quality Assurance and Warranty

The Four Seasons Thermostat Housing 85961 meets or exceeds OEM quality standards, providing dependable performance and durability. The product includes a thermostat and gasket to ensure a complete and reliable replacement. Warranty details vary by distributor but typically cover defects in materials and workmanship.