Four Seasons 86288 Engine Coolant Thermostat Housing - Lower

Thermostat Housing for Hyundai and Kia

Four Seasons 86288 is an engine coolant thermostat housing built for specific Hyundai and Kia applications. It is a plastic thermostat housing with the gasket or seal included, and it is supplied without a thermostat for direct replacement of the housing assembly.

Key Features

• Plastic thermostat housing construction
• Gasket or seal included
• Thermostat not included
• Style: w/o thermostat
• Meets or exceeds OEM requirements
• Inlet port diameter: 1.37 in.
• Bolt hole center to bolt hole center: 3.62 in.
• Flange thickness: 2.74 in.
• Overall height: 3.53 in.

Product Details

Four Seasons Thermostat Housing 86288 is an OE-style engine coolant component designed for cooling system service on Hyundai Sonata, Hyundai Santa Fe, Hyundai Santa Fe Sport, Kia Optima, Kia Sorento, and Kia Sportage applications. This housing is built to match the listed fitment and dimensions, including the 1.37-inch inlet port diameter and 3.62-inch bolt hole center spacing, for a precise replacement of the original thermostat housing. This part cross-references Focus Auto Parts 86288 for the same application.

Compatible With 2015-2019 Hyundai Sonata, lower and non-lower applications as listed; 2019-2020 Hyundai Santa Fe, lower; 2017-2018 Hyundai Santa Fe Sport, lower; 2016-2020 Kia Optima, lower and non-lower applications as listed; 2016-2018 Kia Sorento, lower and non-lower applications as listed; and 2017 Kia Sportage, lower. Part number 86288 is also referenced in OE-style replacement searches for these Hyundai and Kia cooling system applications.

Common Replacement Reasons

• Cracked or warped thermostat housing
• Coolant seepage at the housing or seal surface
• Damaged mounting points or flange wear
• Cooling system service requiring housing replacement without thermostat transfer
• Fitment-specific replacement for Hyundai Sonata, Kia Optima, and related models

Installation Notes

Verify the vehicle year, make, model, and housing position before installation. Confirm the inlet port diameter, bolt hole spacing, and flange thickness against the original part to ensure proper alignment. Because the thermostat is not included, reuse or replace the thermostat separately as needed during cooling system service. Inspect mating surfaces and coolant passages before assembly, and replace the seal if the original surface is damaged.

Quality Assurance

Four Seasons lists this thermostat housing as meeting or exceeding OEM requirements. The part is built as an OE-style replacement for the specified Hyundai and Kia cooling system applications and is intended to restore proper thermostat housing function when the original housing is worn or damaged.