Motorad 426-190 Engine Coolant Thermostat

OE-Style Cooling Control for Ram Trucks

The Motorad Standard 426-190 engine coolant thermostat is built for precise temperature control in heavy-duty cooling systems. It uses OEM-quality materials, a copper case, and a wax compound for quick response to coolant temperature changes, making it a direct-fit choice for Ram 2500 and Ram 3500 cooling service.

Compatible with 1998-2025 Ram and Dodge Ram truck applications listed below, this thermostat is specified at 192°F and includes an O-ring seal for a clean, reliable installation. The offset design and air relief valve help support proper coolant flow and air purge in demanding engine cooling systems.

Key Features

• Motorad Standard line engine coolant thermostat
• Part number 426-190
• Start-to-open temperature: 192°F
• Copper case and wax compound for responsive temperature regulation
• Offset design with air relief valve
• Includes gasket/seal with rubber O-ring seal type
• Jiggle pin weep hole included
• OE supplier manufacturing with OEM specifications and processes

Detailed Description

The Motorad 426-190 thermostat is engineered for vehicles that need stable coolant temperature control under load. Its 192-degree opening point matches OE-specified temperature requirements for many Ram 2500, Ram 3500, and Ram 4000 applications, helping the engine reach and maintain operating temperature as intended. The sealing flange, bypass dimensions, and OEM-style sealing approach support proper fitment in the thermostat housing assembly.

This part cross-references Dorman - HELP 49219 and Stant 14289 for the same application. The Motorad Standard product line focuses on OE-style replacement cooling components built to factory specifications, making this thermostat a practical service part for Ram truck cooling system maintenance.

What It Helps Address

• Engine running too cool or too warm
• Delayed warm-up in cold weather
• Temperature fluctuation during towing or heavy use
• Coolant flow issues related to a worn thermostat
• Cooling system service on Ram 2500, Ram 3500, and Ram 4000 models

Installation Notes and Tips

• Verify the thermostat housing and sealing surfaces are clean before installation.
• Use the included O-ring seal during assembly.
• Confirm the 192°F temperature specification matches the vehicle application.
• Bleed trapped air from the cooling system after service to help restore normal circulation.
• Check coolant condition and replace degraded coolant during thermostat replacement.

Quality Assurance

Manufactured by an OE supplier using OEM-quality materials, OEM specifications, and factory-style processes. The copper case, wax compound, and included seal are selected to meet the demands of automotive cooling systems in Ram and Dodge Ram truck applications.