Motorad 319-170 Engine Coolant Thermostat

Engine Coolant Thermostat for Mazda Applications

The Motorad Standard 319-170 engine coolant thermostat is built for precise temperature control in a wide range of Mazda and select Ford and Chevrolet applications. With a 170°F rating, copper case construction, and wax compound response, it is engineered to react quickly to coolant temperature changes and support stable engine operating temperature.

Compatible With 2019 Mazda CX-5, 2013-2016 Mazda CX-5, 2012-2018 Mazda 3, 2018 Mazda 3 Sport, 2014-2016 Mazda 3 Sport, 2011 Mazda 3 Sport, 2014-2018 Mazda 6, 2011-2014 Mazda 2, 2004 Chevrolet Tracker, 1999-2003 Mazda Protege, 2002-2003 Mazda Protege5, 1993-2002 Mazda 626, 1995-2002 Mazda Millenia, 1996-1998 Mazda MPV, 1993-1997 Ford Probe, 1993-1997 Mazda MX-6, and 1992-1995 Mazda MX-3.

Key Features

• 170°F thermostat calibration for controlled coolant flow
• Copper case and wax compound for fast response to temperature changes
• Offset design with air relief valve where applicable
• OEM-style seals included where applicable
• Jiggle pin weep hole for air bleeding during service
• Sealing flange outside diameter: 2.047 in.
• Bypass diameter: 1.09 in.
• Bypass length: 1.61 in.
• Flange thickness: 0.05 in.
• Motorad Standard line OE-style replacement part

Product Details

Motorad 319-170 is a Standard-line engine coolant thermostat manufactured to OEM quality materials and safety standards by an OE supplier. It follows OEM specifications and processes to deliver consistent thermostat operation in demanding cooling systems. This part cross-references Karlyn 107 for the same application.

For Mazda 3, Mazda 6, Mazda CX-5, and Mazda 2 service work, the 319-170 provides a direct-fit thermostat option with a 170°F opening temperature. The design includes a jiggle pin weep hole and offset configuration to support proper coolant circulation and air management in the cooling system.

Common Cooling System Issues It Can Address

• Engine running cooler or warmer than expected due to thermostat wear
• Delayed coolant circulation after cold start
• Temperature fluctuation caused by a sticking thermostat
• Air trapped in the cooling system after service
• Cooling system performance concerns on Mazda and select Ford or Chevrolet applications

Installation Notes and Tips

Verify the thermostat housing, bypass dimensions, and temperature rating before installation. Clean the sealing surfaces thoroughly and inspect the cooling system for contamination, damaged hoses, or weak coolant before replacing the thermostat. Follow the vehicle service procedure for coolant refill and air bleeding so the jiggle pin weep hole can function as intended.

Quality Assurance

Motorad manufactures this thermostat with OEM-quality materials and processes as an OE supplier, using a copper case and wax compound for responsive temperature control. The Standard line is built to meet OEM specifications for fit and function in the listed applications.