Motorad CH2003 Engine Coolant Thermostat Housing - Lower

Engine Coolant Thermostat Housing for GM Applications

The Motorad CH2003 engine coolant thermostat housing is built for direct replacement use on select Chevrolet and GMC cooling systems. It is engineered to OE quality standards and validated for thermal shock and leak resistance to support dependable coolant flow control.

• Engine coolant thermostat housing for lower-position applications
• Manufactured by an OE supplier to OEM quality standards
• Uses proprietary material for demanding cooling system conditions
• Thermal shock validated for temperature cycling durability
• 100% leak tested before release

Fitment and Cross Reference

• Fits 1998-2005 Chevrolet LUV, lower; includes coolant adapter pipe and gasket.
• Fits 1998-2003 Chevrolet S10, lower; includes coolant adapter pipe and gasket; adapter housing; with pipe; without cover.
• Fits 1998-2003 GMC Sonoma, lower; includes coolant adapter pipe and gasket; adapter housing; with pipe; without cover.

This part cross-references Dorman OE Solutions 902-103 and Dorman Conduct-Tite 85921 for the same application. Motorad CH2003 is also referenced by 9CH2003 and 12563996.

What It Helps Address

• Coolant leaks at the thermostat housing
• Cracked or warped housing surfaces
• Improper coolant routing at the lower housing location
• Temperature-related sealing failures
• Replacement needs on Chevrolet S10 and GMC Sonoma cooling systems

Installation Notes

Verify lower-position fitment before installation. Match the housing to the vehicle’s existing coolant adapter pipe and gasket configuration, and inspect the mating surfaces for corrosion or residue before assembly. Confirm the thermostat and related cooling components are in serviceable condition during replacement.

Quality Assurance

Motorad manufactures this thermostat housing to OEM standards as an OE supplier. The CH2003 is thermal shock validated and 100% leak tested to support consistent sealing performance in automotive cooling systems.