Motorad 333-198 Engine Coolant Thermostat

Engine Coolant Thermostat for Ford and Mazda

Motorad Standard 333-198 is an engine coolant thermostat built to OE specifications for precise temperature control in demanding cooling systems. It starts to open at 198°F and includes an O-ring seal, jiggle pin weep hole, and OEM-style sealing details where applicable.

Compatible With 1990-2000 Ford Ranger, 1991-2000 Ford Explorer, 1995-1997 Ford Aerostar, 1991-1994 Mazda Navajo, and 1994-2000 Mazda B4000. The Motorad 333-198 is a direct-fit thermostat choice for drivers servicing factory-style cooling performance on these applications.

Key Features

• Standard engine coolant thermostat with 198°F opening temperature
• OE supplier manufacturing with OEM-quality materials and processes
• Copper case and wax compound for responsive coolant temperature control
• Offset design with air relief valve where applicable
• Includes gasket/seal with rubber O-ring construction
• Jiggle pin weep hole helps purge trapped air during service
• Sealing flange outside diameter: 2.05 in
• Height between flanges: 1.05 in; overall height: 1.5 in

Detailed Description

Motorad Standard 333-198 is engineered as an OE-style replacement thermostat for Ford Ranger, Ford Explorer, Ford Aerostar, Mazda Navajo, and Mazda B4000 cooling systems that call for a 198°F thermostat. The copper case and wax compound are selected for quick reaction to coolant temperature changes, helping the engine reach and maintain the specified operating range. The included rubber O-ring seal and OEM-style sealing features support a proper fit during thermostat service.

This part cross-references Four Seasons 33398 for the same application.

What This Part Helps Address

• Engine running cooler or warmer than the specified operating temperature
• Delayed warm-up after a cold start
• Temperature fluctuation caused by a sticking thermostat
• Coolant flow control issues during routine cooling system service
• Seal-related leaks at the thermostat housing interface

Installation Notes and Tips

• Verify the 198°F temperature specification before installation.
• Inspect the thermostat housing and sealing surfaces for corrosion or debris.
• Replace coolant as needed and bleed air from the system after service.
• Use the jiggle pin orientation recommended by the vehicle service procedure when applicable.
• Confirm fitment by year, make, and model before ordering.

Quality Assurance

Motorad manufactures this thermostat to OEM specifications and processes using OEM-quality materials and safety standards as an OE supplier. The Standard line focuses on direct replacement cooling-system components for factory-style fit and temperature control.