Motorad 5657-203 Engine Coolant Thermostat

Engine Coolant Thermostat Overview

Motorad UltraStat engine coolant thermostat 5657-203 is an OEM-style replacement built for cooling system control and corrosion resistance. It is listed for a wide range of Chrysler, Dodge, and Jeep applications, including Dodge Journey, Jeep Compass, and Jeep Patriot.

Key Features

• Stainless steel construction for long-life durability and corrosion resistance.
• OEM design and OEM grade for direct-style service replacement.
• BLVT valve technology helps reduce thermal shock to cooling system components.
• Includes an O-ring seal; gasket or seal is required and included.
• Jiggle pin weep hole and non-electric design for conventional cooling system operation.
• Starts to open at 203°F for temperature regulation in the specified application.

Detailed Description

The Motorad UltraStat 5657-203 thermostat is engineered as an OEM-style engine coolant thermostat for Chrysler, Dodge, and Jeep cooling systems. Its stainless steel body and corrosion-resistant construction support consistent operation in demanding service conditions, while the BLVT valve design is intended to minimize thermal shock as coolant flow changes. This part number, 5657-203, is associated with fitments such as Fits 2009-2020 Dodge Journey, N/A; Fits 2007-2017 Jeep Compass, N/A; and Fits 2007-2017 Jeep Patriot, N/A. It also cross-references Monroe Shocks & Struts (e.g., 203-7565) for the same application.

Common Issues It Can Help Address

• Engine running too cool or too hot due to thermostat wear.
• Delayed coolant flow control during warm-up.
• Corrosion-related thermostat deterioration.
• Temperature fluctuation caused by a sticking thermostat.
• Cooling system stress from abrupt thermal changes.

Installation Notes and Tips

Verify the sealing flange dimensions, seal type, and opening temperature before installation. This thermostat uses an O-ring seal and requires a gasket or seal; installation tool is not included. Confirm the application by year, make, and model before service, especially for Dodge Journey, Jeep Compass, Jeep Patriot, Chrysler 200, and related Chrysler, Dodge, and Jeep vehicles. The part number 5657-203 should be matched to the vehicle’s cooling system specification.

Quality Assurance

UltraStat is Motorad’s OEM-style thermostat line, built with heavy-gauge stainless steel construction and valve technology focused on stable cooling system performance.