Gates 34857 Engine Coolant Thermostat

Integrated Thermostat Housing for OE Temperature Control

Gates Integrated Housing Thermostat 34857 is an engine coolant thermostat assembly built for precise temperature regulation in modern cooling systems. It is a direct-fit style replacement for select Ford and Lincoln applications, including Mustang, Transit Connect, Escape, Fusion, MKZ, Explorer, MKC, Edge, and Focus models.

The Gates integrated thermostat housing line focuses on accurate coolant flow control in applications that use a combined thermostat and housing design. Part number 34857 follows OE performance expectations and includes a seal for service-ready replacement on the listed vehicles.

Key Features

• Integrated housing thermostat design for vehicles that use a combined thermostat and housing assembly
• Start-to-open temperature: 180°F / 82°C
• OE performance rating for factory-style temperature control
• 3 bolt holes for secure mounting
• Check valve design with 1 jiggle pin/check valve
• 1 seal included
• Non-electric thermostat construction
• Outlet dimensions: 1.38 in and .83 in outside diameter; 1.16 in and .59 in inside diameter

Detailed Description

Gates 34857 is an integrated housing thermostat engineered for cooling systems that require the thermostat and housing to function as one assembly. By regulating coolant flow at the specified 180-degree opening temperature, it helps maintain stable engine operating temperature in everyday driving and under varying load conditions. This part number is listed for 2015-2023 Ford Mustang, 2019-2023 Ford Transit Connect, 2017-2020 Ford Escape, 2017-2020 Ford Fusion, 2017-2020 Lincoln MKZ, 2016-2019 Ford Explorer, 2015-2019 Lincoln MKC, 2016-2018 Ford Edge, and 2016-2018 Ford Focus.

Gates integrated thermostat housings are developed as aftermarket alternatives to OE dealership parts, with attention to temperature accuracy and fitment for vehicles that use integrated cooling components. This part cross-references Dorman - OE Solutions 902-1076 for the same application.

What It Helps Address

• Engine running too cool or too hot due to thermostat control issues
• Coolant temperature fluctuation during normal driving
• Cooling system service needs on integrated housing designs
• Replacement of a worn thermostat housing on Ford Mustang, Ford Escape, or Lincoln MKZ applications
• Restoring OE-style coolant flow control in Ford Fusion, Ford Explorer, and Ford Focus models

Installation Notes and Tips

Verify the engine application, outlet dimensions, and bolt-hole count before installation. This thermostat uses a 3-bolt integrated housing layout and a non-electric design, so connector-based electrical replacement is not required. Inspect the mating surfaces and cooling system condition during service, and confirm the correct 180°F / 82°C temperature specification for the vehicle.

Quality Assurance

Gates backs this integrated thermostat housing with OE-performance positioning and application-specific engineering for modern cooling systems. The brand’s aftermarket thermostat development is focused on providing a reliable alternative to dealership replacement parts for the listed Ford and Lincoln vehicles.