Motorad 5166KTFS Engine Coolant Thermostat Housing Assembly

Engine Coolant Thermostat Housing Assembly

Motorad 5166KTFS is an engine coolant thermostat housing assembly built to OE specifications for consistent cooling-system control. It includes the housing, a Fail-Safe thermostat, and a seal, with a 195°F opening temperature for direct replacement service on a wide range of GM vehicles.

Designed for Buick Century, Chevrolet Impala, Pontiac Grand Prix, and other listed applications, this Motorad Kit line part is made with OEM-quality materials and processes. The copper case and wax compound are engineered for quick response to coolant temperature changes, helping the engine reach and maintain the specified operating range.

Key Features

• Part number 5166KTFS thermostat housing assembly for OE-style replacement
• 195°F thermostat temperature for specified factory cooling performance
• Includes housing, Fail-Safe thermostat, and seal
• Steel, stainless steel, copper, and rubber construction
• 1 outlet port, 2 bolt holes, and 0.92 in bypass diameter
• Black and silver finish with 1.8 in flange diameter
• Rubber seal material with 1.32 in outlet diameter

Product Details

The Motorad Kit line focuses on thermostat and housing assemblies built to OE specifications for service replacement. This 5166KTFS unit is engineered for vehicles that require a 195°F thermostat housing assembly, with a copper thermostat element that reacts quickly to coolant temperature changes. It is a direct-fit cooling system service part for applications such as Chevrolet Impala, Pontiac Grand Prix, and Buick Century, where stable coolant regulation is critical to engine operation.

This part cross-references 95166KTFS for the same application.

Common Cooling System Issues It Can Address

• Engine running cooler or warmer than the specified thermostat temperature
• Coolant flow control problems caused by a worn thermostat housing assembly
• Temperature fluctuation from a thermostat that no longer responds consistently
• Leak concerns at the housing or seal interface when replacing a serviceable assembly
• Cooling-system service needs on high-mileage GM passenger cars and minivans

Installation Notes

Verify the vehicle’s year, make, model, and OE-specified thermostat temperature before installation. This assembly uses a 2-bolt housing design and does not include gasket or seal hardware beyond the listed seal. Clean the mating surfaces thoroughly, inspect the coolant passages, and refill the system with the correct coolant mixture after installation. Confirm there are no trapped air pockets and check for leaks once the engine reaches operating temperature.

Quality Assurance

Motorad manufactures this thermostat housing assembly with OEM-quality materials and safety standards through an OE supplier process. The part is built to OEM specifications and processes for dependable fit and temperature control in demanding automotive cooling systems.

Compatible with 1991-2007 Buick Century, Buick Regal, Buick Skylark, Buick Rendezvous, and Terraza applications; 1991-2005 Chevrolet Lumina, Monte Carlo, Corsica, Malibu, Impala, and Lumina APV applications; 1991-2005 Pontiac Grand Prix, Grand Am, Trans Sport, and Aztek applications; and 1994-2006 Oldsmobile Cutlass, Cutlass Supreme, Cutlass Ciera, Cutlass Cruiser, Achieva, Alero, and Silhouette applications.