Four Seasons 86331 Engine Coolant Thermostat Housing

Four Seasons 86331 Thermostat Housing

Four Seasons 86331 is an engine coolant thermostat housing for select Toyota applications. It is built from aluminum and supplied without a thermostat or gasket/seal, making it a direct replacement housing for cooling system service on the Corolla, Corolla iM, and C-HR.

Four Seasons Thermostat Housing parts are part of the brand’s cooling and climate-control product line, backed by more than 50 years of mobile A/C experience and tested for dependable operation in everyday use.

Key Features

• Engine coolant thermostat housing for cooling system repair
• Aluminum construction for strength and heat resistance
• Thermostat not included
• Gasket or seal not included
• Inlet diameter: 1.94 in.
• Overall height: 3.55 in.
• Mount flange width: 0.545 in.
• Style: without thermostat

Detailed Description

This Four Seasons thermostat housing, part number 86331, is engineered for Toyota cooling system applications where the housing itself needs replacement. It is a direct-fit engine coolant component for 2019-2020 Toyota C-HR, 2019-2020 Toyota Corolla, and 2018 Toyota Corolla iM. This part cross-references Gates CO35036 for the same application.

Use this thermostat housing when servicing the coolant passage that supports thermostat operation and engine temperature control. The aluminum housing helps provide a durable replacement for worn, cracked, or corroded original components, and the OE-style dimensions support proper fitment in the listed Toyota models.

What It Is Used For

• Replacing a cracked or leaking thermostat housing
• Restoring coolant flow at the thermostat mounting point
• Repairing corrosion or warping in the original housing
• Addressing coolant seepage around the housing interface
• Supporting proper engine temperature regulation after cooling system service

Installation Notes and Tips

• Verify vehicle application before installation: Fits 2019-2020 Toyota C-HR, N/A; Fits 2019-2020 Toyota Corolla, N/A; Fits 2018 Toyota Corolla iM, N/A.
• Inspect the mating surfaces, coolant passages, and adjacent hoses before assembly.
• Because the thermostat and gasket/seal are not included, transfer or source the required service components separately as needed.
• Refill and bleed the cooling system according to Toyota service procedures after installation.

Quality Assurance

Four Seasons engineers and tests its products for long service life and trouble-free operation. Part number 86331 is built to meet the demands of routine cooling system repair on select Toyota Corolla, Corolla iM, and C-HR applications.