Gates CO35025 Engine Coolant Thermostat Housing

Gates Coolant Outlet Thermostat Housing

The Gates CO35025 is an OE-style engine coolant thermostat housing for select Mazda applications. Built as part of the Gates Coolant Outlet line, it addresses common aftermarket fit, material, and design concerns with a direct replacement housing that matches original function and dimensions.

Compatible with Mazda Protege, Protege5, 626, and MX-6 applications, this thermostat housing is designed for accurate coolant routing and dependable long-term service. The Gates CO35025 is a practical choice when replacing a worn or leaking coolant outlet on the engine.

Key Features

• Aluminum thermostat housing construction
• OE Exact fitment designation
• Outlet outside diameter: 1.18 in.
• Outlet inside diameter: 0.87 in.
• 2-bolt mounting design
• Contents: thermostat housing
• Gates Coolant Outlet product line coverage for direct replacement cooling system service

Detailed Product Information

Gates Coolant Outlets are engineered as direct-fit replacements for original coolant outlet and thermostat housing assemblies. The CO35025 uses aluminum construction and OE-style dimensions to help maintain proper coolant flow connection at the engine. This part number, CO35025, is intended for Mazda cooling system repairs where the original housing has cracked, corroded, or begun to leak.

This part cross-references Monroe Shocks & Struts (e.g., FS05-15-176, FS0515176A) for the same application. For buyers searching Mazda Protege thermostat housing, Mazda Protege5 coolant outlet, or Mazda 626 engine coolant water outlet replacement, this Gates housing provides a direct replacement format with application-specific fitment.

What It Helps Fix

• Coolant leaks at the thermostat housing
• Cracked or corroded original coolant outlet
• Improper sealing at the engine coolant water outlet
• Damaged housing from age-related material wear
• Cooling system service on Mazda Protege, Protege5, 626, and MX-6 models

Installation Notes

Verify engine application and outlet dimensions before installation. Inspect the mating surface, hoses, and thermostat area for wear or contamination before transferring the new housing into place. Because gasket quantity is not specified as included, confirm sealing components required for your repair before beginning service.

Compatible With: 1999-2003 Mazda Protege, 2002-2003 Mazda Protege5, 1993-2002 Mazda 626, and 1993-1997 Mazda MX-6. Search terms such as Mazda Protege thermostat housing replacement and Mazda 626 coolant outlet housing are commonly used for this part number, CO35025.

Quality Assurance

Gates designs the Coolant Outlet line to fit and perform like the original component while providing a cost-effective replacement for common cooling system service. The aluminum construction and OE Exact designation support consistent fitment for the listed Mazda applications.