Four Seasons 86378 Engine Coolant Thermostat Housing

Thermostat Housing Overview

The Four Seasons 86378 engine coolant thermostat housing is built for cooling system service where a direct replacement housing is needed. It includes the thermostat and gasket or seal, and the plastic construction matches the style used in modern engine coolant components.

Compatible With Ford Expedition, Ford F-150, Ford Lobo, and Lincoln Navigator applications listed below. This Four Seasons thermostat housing 86378 is a fitment-based replacement for vehicles that use a thermostat housing assembly with the thermostat included.

Key Features

• Thermostat housing assembly with thermostat included.
• Gasket or seal included for sealing at installation.
• Plastic housing construction for engine coolant service.
• 1.28 in inlet diameter for the specified application.
• 2.2 in mounting flange width and 8.5 in overall height.

Detailed Description

Four Seasons 86378 is an engine coolant thermostat housing designed around the listed fitments for 2018-2024 Ford Expedition, 2018-2020 Ford F-150, 2018-2020 Ford Lobo, and 2018-2024 Lincoln Navigator. The housing is supplied in a thermostat housing style with the thermostat included, making it a direct service part for cooling system repairs that require the complete housing assembly. The included gasket or seal supports proper sealing at the coolant connection points, while the plastic body keeps the assembly aligned with the original equipment style used in these applications. This part number, 86378, is also cross-referenced to Motorad TA1068 and other listed interchange numbers for the same application.

Four Seasons backs this product line with more than 50 years of mobile A/C experience and states that its products are engineered and tested for long service life. The Thermostat Housing line focuses on replacement cooling components built for straightforward service work, and part number 86378 follows that approach for Ford and Lincoln cooling system maintenance.

Common Issues This Part Can Address

• Cracked or leaking thermostat housing.
• Failed thermostat assembly requiring replacement.
• Coolant seepage at the housing seal surface.
• Cooling system service where the housing and thermostat are replaced together.
• Restoration of proper coolant flow control in the engine cooling circuit.

Installation Notes and Tips

Verify the vehicle year, make, model, and cooling system configuration against the listed fitment before installation. Inspect the mating surfaces and coolant passages for residue or damage, and replace worn sealing surfaces as needed. Confirm the inlet diameter and mounting flange dimensions match the original part before assembly. Use the included gasket or seal during installation and refill the cooling system according to the vehicle service procedure.

Quality Assurance

Four Seasons states that its products are engineered and tested for years of trouble-free operation. The brand also brings more than 50 years of mobile A/C experience to its cooling and climate control product lines. Part number 86378 is built as a thermostat housing replacement for the listed Ford Expedition, Ford F-150, Ford Lobo, and Lincoln Navigator applications.