Motorad 1115-180 Engine Coolant Thermostat Housing Assembly

Integrated Housing Thermostat for Toyota and Lexus

Motorad 1115-180 is an integrated housing thermostat assembly built for select Toyota and Lexus cooling systems. It combines the thermostat, housing, and gasket in one service part for a direct replacement on applications such as the Toyota RAV4, Camry, Sienna, Venza, and Lexus ES250.

Key Features

• Integrated housing thermostat assembly with thermostat, housing, and gasket
• 180°F opening temperature for OE-specified cooling control
• Plastic black housing with two outlet ports
• Bleeder hole included for coolant service and air removal
• O-ring style seal with rubber gasket material
• OE supplier manufacturing using OEM-quality materials and processes
• Cross-reference part numbers include 16031-25010 and 11158

Product Details

This Motorad Integrated Housing Thermostat line is built for modern engine cooling systems that require precise temperature regulation and a housing-mounted thermostat design. Part number 1115-180 uses OEM specifications and manufacturing processes, with a copper case and wax compound for quick response to coolant temperature changes. The 180°F calibration supports factory-style engine warm-up and operating temperature control on covered Toyota and Lexus applications.

Compatible With 2021-2025 Lexus ES250, 2022-2025 Lexus NX250, 2023-2025 Lexus NX350h, 2022-2025 Toyota RAV4, 2022-2025 Toyota Sienna, 2023-2024 Toyota Camry, 2021-2024 Toyota RAV4 Prime, and 2022-2024 Toyota Venza. Additional coverage includes 2022 Toyota Avalon and Camry, 2021 Lexus ES300h, 2019-2021 Toyota Avalon, Camry, Highlander, RAV4, Sienna, and Venza, plus 2019-2020 Lexus ES300h.

Common Uses

• Restoring proper coolant temperature control after thermostat wear
• Replacing a leaking or cracked thermostat housing
• Addressing coolant seepage at the housing seal or O-ring
• Correcting slow warm-up or temperature fluctuation concerns
• Servicing an OE-style integrated thermostat assembly on Toyota and Lexus engines

Installation Notes and Tips

Verify engine application by year, make, model, and OE temperature specification before installation. Inspect the mating surface, coolant passages, and hose connections for residue or damage, and replace coolant as required by the service procedure. Mounting hardware and bolts are not included, so reuse or source the correct fasteners separately if needed. The bleeder hole helps with coolant bleeding during refill and air purge.

Quality Assurance

Motorad manufactures this thermostat housing assembly with OEM-quality materials and safety standards as an OE supplier. The design is intended to meet factory specifications for fit, temperature response, and cooling-system durability on the listed Toyota and Lexus applications.