Motorad CH2121 Engine Coolant Thermostat Housing - Upper

Engine Coolant Thermostat Housing Overview

Motorad CH2121 is a metal engine coolant thermostat housing built to OEM quality standards for demanding cooling system service. It is a standard replacement part with a silver finish, thermal shock validation, and 100% leak testing for dependable sealing performance.

Key Features

• Metal construction for cooling system durability
• Standard replacement design for direct service use
• Thermal shock validated for temperature cycling
• 100% leak tested for sealing verification
• Single outlet port with no gasket or mounting hardware included

Detailed Description

This Motorad thermostat housing, part number CH2121, is engineered as an OE-supplier replacement for cooling system repair and maintenance. The housing uses proprietary material and is manufactured to OEM quality standards, with a 6.50-inch height, 9 mounting holes, and a 1.40-inch outlet port inside diameter. It is designed for upper cooling system applications on Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD models. The CH2121 is also cross-referenced to Four Seasons 86221 for the same application.

Common Uses

• Cracked or warped thermostat housing replacement
• Coolant seepage at the housing sealing surface
• Leak repair after thermal cycling damage
• Restoring proper coolant routing through the housing
• Service replacement for worn upper cooling system components

Installation Notes and Tips

Verify the upper mounting location, outlet port dimensions, and mounting hole pattern before installation. Because no gasket or mounting hardware is included, confirm the required sealing components are on hand before service. Match the part number CH2121 to the vehicle application and inspect the mating surfaces for corrosion or residue before assembly.

Quality Assurance

Motorad manufactures this housing to OEM quality standards as an OE supplier. It is thermal shock validated and 100% leak tested to confirm performance under cooling system conditions.