Four Seasons 86353 Engine Coolant Thermostat Housing

Thermostat Housing for Land Rover Cooling Systems

Four Seasons 86353 is an integrated engine coolant thermostat housing built for Land Rover cooling system service. It combines the thermostat housing and thermostat in one plastic assembly, with a gasket or seal included for a cleaner replacement on select Discovery, Defender, Range Rover, and Range Rover Evoque applications.

Four Seasons’ Thermostat Housing line focuses on replacement cooling components engineered and tested for dependable operation. Part number 86353 follows that approach with an integrated design that supports proper coolant flow and temperature control in the engine cooling circuit.

Key Features

• Integrated thermostat housing with thermostat included
• Gasket or seal included
• Plastic housing construction
• Inlet diameter: 1.51 in.
• Overall height: 6.49 in.
• Mounting flange width: 0.487 in.
• Engine coolant components for cooling system repair

Detailed Description

Four Seasons 86353 thermostat housing is a direct-fit cooling system component for select Land Rover models, including Discovery, Defender 110, Defender 90, Range Rover Velar, Discovery Sport, Range Rover, Range Rover Sport, and Range Rover Evoque. This part number 86353 is built as an integrated thermostat housing, which means the thermostat is part of the assembly rather than a separate service item.

Use this thermostat housing when replacing a cracked plastic housing, servicing a leaking coolant outlet, or restoring temperature regulation in the engine cooling system. This part cross-references LR093328 and LR106640 for the same application.

What It Helps Address

• Coolant leaks at the thermostat housing
• Cracked or heat-aged plastic housing failure
• Erratic engine operating temperature
• Thermostat-related cooling flow issues
• Service replacement for worn coolant components

Installation Notes and Tips

• Verify vehicle fitment by year, make, and model before installation.
• Confirm the inlet diameter and mounting dimensions match the original part.
• Inspect the mating surfaces and coolant passages before assembly.
• Replace the included gasket or seal during installation.
• Refill and bleed the cooling system according to the vehicle service procedure after installation.

Quality Assurance

Four Seasons backs this thermostat housing with more than 50 years of mobile A/C and thermal management experience. The brand states its products are engineered and tested for years of trouble-free operation, supporting a repair-focused replacement for Land Rover cooling system service.