Motorad 623-189 Engine Coolant Thermostat Housing Assembly

Overview of Motorad Integrated Housing Thermostat 623-189

The Motorad Integrated Housing Thermostat 623-189 is engineered for precise engine temperature regulation in select Mercedes-Benz models. Designed to maintain optimal coolant flow, this thermostat housing assembly supports efficient engine performance and longevity.

• Compatible with Mercedes-Benz E350, GL320, ML320, R320, R350, Sprinter 2500, Sprinter 3500, and Sprinter 3500XD
• Thermostat opening temperature at 189°F for accurate temperature control
• Constructed from durable aluminum, stainless steel, and copper materials
• Includes a rubber gasket/seal and a bleeder hole for effective coolant system venting
• Features 4 bolt holes and a single 1.91-inch outlet port
• Equipped with a jiggle pin to prevent air lock in the cooling system

About the Integrated Housing Thermostat Product Line

The Motorad Integrated Housing Thermostat line combines the thermostat and housing into a single assembly, simplifying installation and improving reliability. This design reduces potential leak points and ensures consistent thermostat operation, which is critical for maintaining the correct engine temperature in Mercedes-Benz vehicles.

Detailed Product Description

The Motorad 623-189 thermostat housing assembly is crafted from a combination of aluminum, stainless steel, and copper, providing strength and corrosion resistance. It features a built-in thermostat calibrated to open at 189 degrees Fahrenheit, ensuring the engine reaches and maintains optimal operating temperature. The assembly includes a rubber gasket to create a secure seal and prevent coolant leaks. A bleeder hole is incorporated to allow trapped air to escape, reducing the risk of overheating. The jiggle pin further aids in air removal, enhancing coolant circulation. With four bolt holes and a single outlet port measuring 1.91 inches in diameter, this housing assembly is designed for direct replacement on compatible Mercedes-Benz models.

Common Applications and Issues Addressed

• Replacement for faulty or leaking thermostat housing assemblies in Mercedes-Benz E350, GL320, ML320, R320, R350, and Sprinter models
• Resolves engine overheating caused by thermostat failure or coolant flow restriction
• Eliminates coolant leaks due to worn or damaged seals
• Prevents air lock in the cooling system with integrated bleeder hole and jiggle pin
• Restores proper engine temperature regulation for improved fuel efficiency and emissions

Installation Notes and Tips

• Ensure the engine is cool before beginning installation to avoid burns or injury
• Replace the rubber gasket included with the assembly to ensure a proper seal
• Do not reuse old mounting hardware; new bolts are required but not included
• Bleed the cooling system after installation to remove trapped air using the bleeder hole and jiggle pin features
• Verify thermostat opening temperature matches vehicle specifications (189°F for this part)

Quality Assurance and Warranty

Motorad manufactures the 623-189 thermostat housing assembly to meet OEM standards for fit, form, and function. The use of high-quality materials such as aluminum, stainless steel, and copper ensures durability and corrosion resistance. This part includes a rubber gasket for reliable sealing. While specific warranty details are not provided, Motorad products typically adhere to industry quality controls to support long-term vehicle performance.