Motorad 416-203 Engine Coolant Thermostat

Engine Cooling Thermostat for OE-Style Temperature Control

The Motorad Standard 416-203 engine coolant thermostat is built for precise coolant regulation in demanding cooling systems. It opens at 203°F and uses OEM-quality materials, a copper case, and wax compound for responsive temperature changes in the coolant.

Compatible With select Dodge Durango, Jeep Grand Cherokee, Ram 1500, and Chrysler 300 applications, this thermostat is a direct-fit style replacement for many 203°F OE-spec systems. The Motorad 416-203 is also listed for additional Chrysler, Dodge, Jeep, and Ram models across a broad range of years.

Key Features

• Standard engine coolant thermostat with 203°F start-to-open temperature
• OEM-quality materials and OE-supplier manufacturing process
• Copper case and wax compound for fast response to coolant temperature changes
• Offset design with air relief valve
• Includes gasket/seal with O-ring seal type
• Jiggle pin weep hole included for air bleeding during service
• Rubber seal material for proper sealing performance

Detailed Product Overview

Motorad Brand Line Standard focuses on OE-style cooling system service parts built to match factory specifications and processes. This thermostat is engineered for vehicles that require a 203°F operating temperature and is suited for applications such as Dodge Charger, Jeep Grand Cherokee, Ram 2500, and Chrysler 300 cooling systems where stable temperature control is important. Part number 416-203 is designed with a 2.5-inch sealing flange outside diameter, 1.6-inch height between flanges, and 0.05-inch flange thickness for proper housing fitment.

This part cross-references Gates 51603 and Stant 48792 for the same application.

What It Helps Address

• Engine running cooler or hotter than the specified thermostat range
• Delayed coolant flow regulation after cold start
• Temperature fluctuation in the radiator and engine cooling circuit
• Service replacement for worn thermostat seals or housing sealing surfaces
• Cooling system maintenance on 203°F OE-spec applications

Installation Notes and Tips

Verify the thermostat temperature rating, seal style, and housing dimensions before installation. The included O-ring seal should be seated cleanly, and the jiggle pin weep hole should be positioned to help purge trapped air during refill. Because this thermostat is application-specific, confirm vehicle year, make, model, and cooling system requirements before service. Part number 416-203 is listed for many Chrysler, Dodge, Jeep, and Ram vehicles, including select Dodge Durango, Jeep Grand Cherokee, and Ram 1500 models.

Quality Assurance

Manufactured to OEM specifications and processes by an OE supplier using OEM-quality materials and safety standards. The copper case and wax compound are selected to support consistent thermostat response in demanding automotive cooling systems.