Stant 48258 Engine Coolant Thermostat

Reliable Engine Cooling for Infiniti G20

The Stant OE Exact Thermostat 48258 is engineered to maintain optimal engine temperature for your Infiniti G20. Designed with precise dimensions and a 180-degree Fahrenheit opening temperature, this engine coolant thermostat ensures consistent performance and efficient cooling system operation.

• Bypass Plate Diameter: 1.1 inches
• Flange Diameter (Without Seal): 2.12 inches
• Height from Flange to Bottom: 1.3 inches
• Height from Flange to Top of Bridge: 0.68 inches
• Temperature Rating: 180 degrees Fahrenheit

About the Stant OE Exact Thermostat Product Line

The OE Exact Thermostat line by Stant is designed to meet original equipment specifications for precise fit and function. This ensures that the 48258 thermostat matches the exact dimensions and temperature requirements of the original part used in the Infiniti G20, providing reliable engine temperature regulation without modification.

Product Details and Specifications

The Stant 48258 thermostat features a 1.1-inch bypass plate diameter and a flange diameter of 2.12 inches (excluding the seal), which are critical for proper coolant flow and sealing within the thermostat housing. The height measurements—1.3 inches from flange to bottom and 0.68 inches from flange to top of bridge—ensure compatibility with the engine’s cooling system layout. The thermostat opens at 180 degrees Fahrenheit, allowing coolant to circulate once the engine reaches optimal operating temperature, preventing overheating and promoting efficient engine performance.

Common Applications and Problem Solving

• Maintains proper engine temperature in Infiniti G20 models
• Prevents engine overheating by regulating coolant flow
• Replaces faulty or stuck thermostats causing poor temperature control
• Helps avoid coolant leaks due to precise flange fit
• Supports consistent engine warm-up times for improved fuel efficiency

Installation Notes and Tips

When installing the Stant OE Exact Thermostat 48258, ensure the thermostat is oriented correctly according to the vehicle’s service manual. Verify that the flange and bypass plate dimensions match the original part to avoid leaks or improper fit. It is recommended to replace the gasket or seal during installation to maintain a secure seal. Proper coolant system bleeding after installation will help prevent air pockets and ensure optimal thermostat function.

Quality Assurance and Warranty

Stant OE Exact Thermostats are manufactured to meet strict quality standards, ensuring durability and reliable performance. The 48258 thermostat is designed to match OEM specifications for the Infiniti G20, providing confidence in fit and function. Warranty details are available through Stant and typically cover defects in materials and workmanship.