Stant 14399 Engine Coolant Thermostat

OE Type Thermostat for Engine Cooling

Stant 14399 is an OE Type Thermostat built for precise engine coolant temperature control in a wide range of Chevrolet, GMC, Ford, and Hummer applications. With a 190 degree opening temperature and seal included, it supports stable warm-up and consistent cooling system operation in vehicles such as the Chevrolet Express 2500, GMC Savana 3500, and Ford F-250.

Key Features

• 190 degree thermostat opening temperature for OE-style coolant regulation
• Original equipment design for direct-fit cooling system service
• Durable construction for long service life
• Stainless steel assembly engineered for smooth operation
• Seal included for listed applications
• Flange diameter: 2.3 in. with seal and without seal
• Height from flange to bottom: 0.87 in.
• Height from flange to top of bridge: 0.68 in.

Product Details

The Stant OE Type Thermostat line is built to match original equipment design expectations for temperature control and fitment. Part number 14399 is specified at 190 degrees and is listed across many heavy-duty and full-size truck and van applications, including Chevrolet C2500, GMC K3500, Ford E-350 Econoline, and Hummer H1. This thermostat is intended for drivers replacing a worn or sticking thermostat in OE-temperature cooling systems where consistent coolant flow matters.

This part cross-references no listed interchange numbers in the provided data.

Common Cooling System Issues It Can Address

• Engine running cooler or hotter than the OE thermostat specification
• Delayed warm-up after cold starts
• Temperature fluctuation during normal driving
• Thermostat sticking open or closed
• Cooling system service on Chevrolet Express 3500, GMC Savana 2500, or Ford F-350 applications

Installation Notes and Tips

Verify the thermostat temperature rating and flange dimensions before installation. Some listed Ford applications note that the seal on the thermostat flange should be removed, while other applications list the seal as included and retained. Several Chevrolet and GMC applications also note a second design or a 2nd design requirement, so confirm the vehicle’s original thermostat style before service. Clean the housing sealing surface and inspect the cooling system before reassembly.

Quality Assurance

Stant designs this OE Type Thermostat with durable materials and a stainless steel assembly for smooth performance and long-term service in OE-style cooling systems.