Motorad 538-187 Engine Coolant Thermostat Housing Assembly

Integrated Housing Thermostat for OE Cooling Control

Motorad Integrated Housing Thermostat Part Number 538-187 is an engine coolant thermostat housing assembly built for OE-style cooling system service. It combines the thermostat, housing, and seal in one replacement unit for direct service on select Chevrolet Colorado, GMC Canyon, Hummer H3, and related applications.

This Integrated Housing Thermostat line is designed around OEM specifications and processes, with OEM-quality materials and an OE supplier manufacturing approach. The copper case and wax compound are used to promote quick response to coolant temperature changes, while the offset design, air relief valve, bleeder hole, and OEM-style sealing features support proper coolant flow and air management.

Key Features

• Motorad Part Number 538-187
• Integrated engine coolant thermostat housing assembly
• Opening temperature: 187 Deg. F
• Bleeder hole and jiggle pin included
• Rubber seal included
• 2 bolt holes with 1 outlet port
• Outlet diameter: 1.59 in
• Material construction includes aluminum, stainless steel, and copper
• Silver finish
• OE-spec temperature control for cooling system service

Detailed Description

Use this thermostat housing assembly when servicing a cooling system that requires a 187F opening temperature and an integrated housing design. Motorad 538-187 is built to OE specifications for vehicles such as the 2004-2012 Chevrolet Colorado, 2004-2012 GMC Canyon, 2006-2010 Hummer H3, and 2009-2010 Hummer H3T. It also cross-references Dorman - OE Solutions 902-847 for the same application.

The integrated design helps simplify replacement by combining the thermostat and housing into one service part. The included rubber seal, bleeder hole, and jiggle pin support installation and coolant air bleeding, while the copper wax-element construction is intended to react quickly to temperature changes in the coolant stream.

What This Part Helps Address

• Engine running too cool or too hot due to thermostat wear
• Coolant temperature instability during normal driving
• Leaks at a worn thermostat housing or seal
• Air trapped in the cooling system after service
• Delayed coolant flow control in OE-specified 187F applications

Installation Notes and Tips

Verify the 187 Deg. F temperature rating and the 2-bolt, 1-outlet housing layout before installation. Confirm the outlet diameter and seal style match the original part on your Chevrolet Colorado, GMC Canyon, Hummer H3, or other listed application. Clean the mating surfaces thoroughly, inspect the cooling system for contamination, and follow the vehicle service procedure for bleeding air from the system using the bleeder hole and jiggle pin features.

Quality Assurance

Motorad manufactures this integrated housing thermostat with OEM-quality materials and OE supplier standards. It is produced to OEM specifications and processes for demanding automotive cooling systems.