Stant 14948 Engine Coolant Thermostat

Stant 14948 Heavy-Duty Thermostat Overview

The Stant 14948 engine coolant thermostat is an OE-style replacement built for GM cooling systems that require a 186 degree opening temperature. It is designed with a stainless steel assembly for smooth operation and durable material construction for long service life.

Compatible With select Buick, Chevrolet, Cadillac, GMC, Pontiac, Hummer, Isuzu, and Saab applications, this heavy-duty thermostat is a direct-fit cooling service part for many GM trucks, SUVs, and performance cars. The Stant 14948 is a practical choice when replacing a worn thermostat in vehicles such as the Chevrolet Silverado 1500, GMC Sierra 2500 HD, and Chevrolet Corvette.

Key Features

• Engine coolant thermostat with a 186 degree opening temperature
• OE design for factory-style cooling system service
• Stainless steel assembly engineered for smooth performance
• Durable material construction for long service life
• Seal included on listed applications
• Bypass plate diameter: 1.5 in.
• Flange diameter: 2.27 in. with or without seal
• Height from flange to bottom: 1.82 in.
• Height from flange to top of bridge: 0.95 in.

Product Details

Stant Heavy-Duty Thermostat line parts are built for dependable temperature control in demanding cooling systems. Part number 14948 follows original equipment design standards and uses a stainless steel assembly to support consistent thermostat movement and stable coolant regulation. This helps maintain the engine’s operating temperature in GM applications that specify a 186 degree thermostat, including many Chevrolet Corvette, Silverado, Tahoe, and GMC Sierra platforms.

This part cross-references applications that use the same OE-style thermostat design for GM cooling service. For fitment verification, match the vehicle year, engine setup, and housing configuration before installation.

Common Problems This Part Addresses

• Engine running too cool or too warm due to a worn thermostat
• Delayed coolant flow regulation after thermostat fatigue
• Temperature fluctuation in GM truck, SUV, and performance applications
• Cooling system service needs after thermostat seal wear
• Replacement of an OE-style thermostat during routine cooling maintenance

Installation Notes

• Fits 2008-2009 Buick Allure, N/A; Temperature 186 Degrees; Seal Included - Seal; Excludes Housing; OE Temperature; Heavy-Duty Thermostat
• Fits 2006-2009 Chevrolet Impala, N/A; Temperature 186 Degrees; Seal Included - Seal; Excludes Housing; OE Temperature; Heavy-Duty Thermostat
• Fits 2004-2008 Chevrolet Corvette, N/A; Temperature 186 Degrees; Seal Included - Seal; Excludes Housing; OE Temperature; Heavy-Duty Thermostat
• Fits 2001-2006 GMC Sierra 2500 HD, N/A; Temperature 186 Degrees; Seal Included - Seal; W/GM Replacement Water Pump; Excludes Housing; OE Temperature; Heavy-Duty Thermostat
• Fits 2000-2006 Chevrolet Tahoe, N/A; Temperature 186 Degrees; Seal Included - Seal; W/GM Replacement Water Pump; Excludes Housing; OE Temperature; Heavy-Duty Thermostat

Confirm housing style and water pump configuration before installation, since some listed applications exclude the housing and others specify use with GM replacement water pumps. Verify the thermostat dimensions and the 186 degree temperature rating against the original part before service.

Quality Assurance

This thermostat is manufactured with OE-style design intent and a stainless steel assembly for consistent operation in service. Stant’s Heavy-Duty Thermostat line is built for long-term cooling system use in applications that demand factory-style temperature control.