Motorad 621-180 Engine Coolant Thermostat

Reliable Engine Coolant Thermostat for Hyundai, Kia, Genesis, and Ram

The Motorad Standard 621-180 engine coolant thermostat is designed to maintain optimal engine temperature for a range of vehicles including Hyundai Sonata, Kia Optima, Genesis G70, and Ram models. This thermostat ensures precise temperature regulation with a start-to-open temperature of 180°F, helping to protect your engine from overheating or inefficient cooling.

• Sealing flange outside diameter: 2.12 inches
• Height between flanges: 1.44 inches
• Overall height: 2.05 inches
• Standard type thermostat with jiggle pin weep hole
• Includes rubber gasket with O-ring seal for secure fit
• Bypass diameter: 1.09 inches and bypass length: 1.36 inches
• Flange thickness: 0.05 inches
• Start to open temperature: 180°F
• Compatible with multiple Hyundai, Kia, Genesis, and Ram models

About the Motorad Standard Product Line

The Motorad Standard line offers dependable engine cooling components designed to meet OEM specifications. The Standard series focuses on delivering consistent performance and fitment, making it suitable for routine maintenance and replacement needs. The 621-180 thermostat is part of this line, providing reliable temperature control with quality sealing features such as an O-ring and included rubber gasket to ensure leak-free operation.

Product Details and Specifications

This engine coolant thermostat features a 180°F start-to-open temperature, which is critical for maintaining proper engine operating temperature. The jiggle pin weep hole allows trapped air to escape, preventing airlock and ensuring efficient coolant flow. The thermostat’s sealing flange outside diameter measures 2.12 inches, with a height between flanges of 1.44 inches and an overall height of 2.05 inches, designed to fit precisely in the cooling system housing. The included rubber gasket and O-ring seal provide a secure, leak-resistant installation. Bypass dimensions of 1.09 inches diameter and 1.36 inches length support proper coolant circulation during thermostat operation.

Compatible Vehicles and Common Applications

• Hyundai Sonata, Accent, Santa Fe Sport, Starex, H100 Van
• Kia Optima, Magentis, Rondo, Stinger
• Genesis G70, G80, Genesis Coupe, GV70, GV80
• Ram models requiring a 180°F thermostat

This thermostat is used to address issues such as:

• Engine overheating due to stuck-closed thermostat
• Poor heater performance from thermostat stuck open
• Coolant leaks around the thermostat housing
• Erratic engine temperature fluctuations
• Air trapped in the cooling system causing inefficient flow

Installation Notes and Tips

Before installation, ensure the engine is cool and the cooling system is depressurized. Replace the old thermostat and gasket with the Motorad Standard 621-180 thermostat, making sure the jiggle pin is positioned correctly to allow air bleed. Use the included rubber gasket and O-ring seal to prevent leaks. No special installation tool is required, but proper torque on the housing bolts is recommended to avoid damage. After installation, bleed the cooling system to remove trapped air and verify proper thermostat operation by monitoring engine temperature.

Quality Assurance and Warranty

The Motorad Standard 621-180 thermostat is manufactured to meet OEM standards for fit and function. It includes a high-quality rubber gasket and O-ring seal to ensure a reliable, leak-free installation. While specific warranty details are not provided, Motorad products typically adhere to industry quality controls to support dependable engine cooling system performance.