Motorad 621-180 Engine Coolant Thermostat

Engine Coolant Thermostat for OE-Style Cooling Control

The Motorad Standard 621-180 engine coolant thermostat is built for precise temperature control in demanding cooling systems. It uses OEM-quality materials and OE-style manufacturing processes to deliver consistent coolant flow regulation for a wide range of Hyundai, Kia, Genesis, and Ram applications.

With a 180°F start-to-open temperature, copper case construction, wax compound response, and included O-ring seal, this thermostat is built for direct replacement service where accurate warm-up and stable operating temperature matter. The Motorad 621-180 also includes an air relief valve and offset design where applicable.

Key Features

• 180°F start-to-open temperature for standard engine cooling control
• Copper case and wax compound for responsive temperature changes in coolant
• OEM-style seals included where applicable
• Jiggle pin weep hole for air bleeding during service
• Rubber O-ring seal included
• Standard thermostat design with offset configuration where applicable
• OE supplier manufacturing with OEM specifications and processes

Product Details

Motorad Standard part number 621-180 is an engine coolant thermostat engineered to regulate coolant flow as the engine reaches operating temperature. The 180-degree design supports stable thermal management, while the copper case and wax element help the thermostat react quickly to coolant temperature changes. This makes it a practical replacement for vehicles that require a standard 180F thermostat with seal.

This part cross-references Continental 62180 and Dorman - HELP 56218 for the same application. It is listed for select applications including 2021-2025 Genesis G80, 2022-2025 Genesis GV70, 2024 Genesis G70, 2021-2024 Genesis GV80, 2022-2023 Kia Stinger, 2020 Hyundai Starex, 2014 Hyundai Santa Fe Sport, 2014 Ram H100 Van, 2010-2013 Hyundai Genesis Coupe, 2007-2012 Kia Rondo, 2006-2008 Hyundai Sonata, 2007-2008 Kia Magentis, 2006-2008 Kia Optima, and 2002 Hyundai Accent.

What It Helps Address

• Slow engine warm-up caused by a thermostat that opens too early
• Overheating concerns related to poor coolant flow regulation
• Temperature fluctuation from a worn thermostat element
• Air trapped in the cooling system during thermostat service
• Coolant seepage at the thermostat seal interface

Installation Notes and Tips

Verify the 180°F temperature rating and seal style before installation. Inspect the housing, sealing surfaces, and coolant condition during replacement, and bleed air from the system after service using the jiggle pin weep hole where applicable. Confirm vehicle-specific fitment for your Hyundai Sonata, Kia Optima, or Genesis application before ordering.

Quality Assurance

Motorad manufactures this thermostat to OEM quality materials and safety standards as an OE supplier, using OEM specifications and processes for consistent fit and function in standard cooling system service.