Motorad 5155KTFS Engine Coolant Thermostat Housing Assembly

OE-Style Thermostat Housing for Lexus Cooling Systems

The Motorad 5155KTFS engine coolant thermostat housing assembly is built for OE-style fitment and temperature control in demanding cooling systems. It is specified for 180°F operation and includes the housing, Fail-Safe thermostat, and seal for select Lexus applications.

Compatible with 1990-1997 Lexus LS400 and 1992-1997 Lexus SC400, this Motorad Kit line part is engineered to match OEM specifications and processes. The copper case and wax compound support quick response to coolant temperature changes, helping maintain stable engine operating temperature.

Key Features

• Engine coolant thermostat housing assembly for select Lexus vehicles
• 180°F thermostat specification
• OE supplier manufacturing with OEM quality materials and safety standards
• Copper case and wax compound for responsive temperature control
• Plastic, stainless steel, copper, and rubber construction
• Black and silver finish
• Jiggle pin included
• 1 outlet port, 1.5 in outlet diameter
• 2.2 in flange diameter with 0.05 in flange thickness
• 1.14 in bypass diameter

Detailed Description

Motorad 5155KTFS is a thermostat housing assembly from the Kit product line, built to OE specifications for direct replacement service on Lexus LS400 and Lexus SC400 models. The design uses OEM-quality materials and manufacturing processes to support consistent coolant flow control and temperature regulation. The included Fail-Safe thermostat is set to 180°F, making this part a practical choice for restoring factory-style thermal management in the cooling system. Part number 5155KTFS is also referenced as 95155KTFS.

What This Part Helps Address

• Engine running too cool or too warm due to thermostat housing wear
• Coolant temperature instability during normal driving
• Housing deterioration from age, heat cycling, or coolant exposure
• Loss of proper thermostat response in Lexus LS400 and SC400 cooling systems
• Service replacement for OE-specified 180°F thermostat housing applications

Installation Notes and Tips

• Verify engine code and application details before installation on 1990-1997 Lexus LS400 or 1992-1997 Lexus SC400.
• Inspect the mating surfaces and cooling passages before assembly.
• This housing does not include bolts.
• This housing does not include a separate gasket or seal beyond the included seal noted in the fitment description.
• Use the correct coolant fill and bleed procedure after installation to remove trapped air.

Quality Assurance

Motorad manufactures this part as an OE supplier using OEM-quality materials and safety standards. The copper case and wax compound are selected to provide fast reaction to coolant temperature changes, supporting reliable thermostat operation in demanding automotive cooling systems.