Motorad 269-174 Engine Coolant Thermostat

Overview of Motorad Standard Engine Coolant Thermostat 269-174

The Motorad Standard Engine Coolant Thermostat 269-174 is designed for precise temperature regulation in select Mercedes-Benz models. This thermostat ensures optimal engine performance by maintaining the coolant flow at a start-to-open temperature of 174°F, suitable for vehicles like the 380SE, 500SL, and S500.

• Start to open temperature: 174°F for accurate engine temperature control
• Sealing flange outside diameter: 2.64 inches for secure fitment
• Height between flanges: 1.93 inches ensuring proper installation depth
• Includes jiggle pin weep hole to prevent air lock and improve coolant circulation
• Bypass diameter of 1.14 inches and bypass length of 1.73 inches for effective coolant flow
• Flange thickness: 0.06 inches for durability and sealing integrity
• Compatible with multiple Mercedes-Benz models including 380SEC, 400E, and SL500

Detailed Product Description

The Motorad Standard Engine Coolant Thermostat 269-174 is engineered to regulate engine temperature by opening at 174 degrees Fahrenheit, allowing coolant to flow through the radiator and maintain optimal operating conditions. Its standard type design features a sealing flange outside diameter of 2.64 inches and a height of 2.75 inches, ensuring a precise fit within the thermostat housing. The included jiggle pin weep hole helps to release trapped air, preventing overheating and improving coolant circulation. This thermostat does not include a gasket or seal, so it is recommended to use a compatible seal during installation. The bypass diameter and length are designed to maintain proper coolant flow even when the thermostat is closed, supporting engine warm-up and preventing cold spots.

About the Motorad Standard Product Line

The Standard line from Motorad offers reliable, OEM-quality replacement parts designed to meet factory specifications. The Standard Engine Coolant Thermostat 269-174 is part of this line, providing consistent performance and fitment for Mercedes-Benz vehicles. This product line focuses on delivering dependable components without additional installation tools or accessories, making it suitable for professional mechanics and experienced DIYers familiar with their vehicle’s cooling system requirements.

Compatible Vehicles and Common Applications

• Mercedes-Benz 380SE, 380SEC, 380SEL, 380SL
• Mercedes-Benz 400E, 400SE, 400SEL
• Mercedes-Benz 420SEL, 500E, 500SEC, 500SEL, 500SL
• Mercedes-Benz 560SEC, 560SEL, 560SL
• Mercedes-Benz CL500, E420, E500, S420, S500, SL500

Issues This Thermostat Addresses

• Engine overheating due to thermostat failure
• Inconsistent engine temperature regulation
• Coolant flow blockage or restricted circulation
• Air lock in cooling system causing hot spots
• Delayed engine warm-up affecting fuel efficiency

Installation Notes and Tips

This thermostat requires careful installation to ensure proper sealing and function. Since no gasket or seal is included, use a compatible gasket designed for your vehicle’s thermostat housing. Verify the sealing flange outside diameter of 2.64 inches matches your housing. The jiggle pin weep hole must be oriented correctly to allow air to escape. No installation tool is included, so standard mechanic tools are necessary. Always drain coolant before removal and refill with the appropriate coolant after installation. Check for leaks and proper thermostat operation during initial engine warm-up.

Quality Assurance and Warranty

Motorad’s Standard line thermostats are manufactured to meet OEM specifications for fit and function. While specific warranty details are not provided here, Motorad products typically come with a limited warranty against defects in materials and workmanship. It is recommended to consult the product packaging or Motorad’s official documentation for exact warranty terms.