Stant 14099 Engine Coolant Thermostat

OE Type Thermostat for Audi and Volkswagen

The Stant 14099 OE Type Thermostat is built to match original equipment temperature control for select Audi, Volkswagen, and Dodge applications. It uses a stainless steel assembly and durable materials to support smooth coolant flow and consistent engine temperature management.

With a 198 Degrees Fahrenheit opening temperature, this thermostat is specified for OE-temperature applications including Audi A6 Quattro, Audi S4, Audi Allroad Quattro, and Volkswagen Passat models that call for this setting. The Stant OE Type Thermostat line focuses on direct-fit cooling system service with OE-style construction.

Key Features

• OE Type Thermostat for engine coolant temperature control
• 198 Degrees Fahrenheit opening temperature
• Stainless steel assembly for smooth operation
• Durable construction for long service life
• Flange diameter: 2.625 in. without seal
• Bypass plate diameter: 1.7 in.
• Height from flange to bottom: 1.03 in.
• Height from flange to top of bridge: 0.73 in.

Product Details

Stant 14099 is an OE-style engine coolant thermostat engineered for vehicles that require a 198 Degrees Fahrenheit thermostat setting. It is a direct cooling-system service part for maintaining proper operating temperature in applications such as Audi A6 Quattro, Audi S4, Audi A8 Quattro, Audi S8, Audi Allroad Quattro, Volkswagen Passat, and Dodge Monaco. The stainless steel assembly and original equipment design support consistent thermostat movement and reliable coolant regulation.

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

Common Cooling System Issues It Can Address

• Engine running cooler or warmer than specified
• Slow warm-up after cold starts
• Temperature gauge fluctuation from thermostat sticking
• Reduced heater performance caused by incorrect coolant regulation
• Cooling system service on OE-temperature applications

Installation Notes and Tips

• Verify the vehicle calls for a 198 Degrees Fahrenheit thermostat before installation.
• Confirm housing style and dimensions against the existing part, especially on Volkswagen Passat applications where the housing includes the thermostat.
• Inspect the cooling system, gasket surfaces, and coolant condition during service.
• Bleed air from the system after installation to restore proper coolant circulation.
• Use the vehicle service procedure for torque and refill specifications.

Quality Assurance

Stant OE Type Thermostat parts are built with OE-style design intent and stainless steel construction for dependable cooling system service. Part number 14099 is specified for direct-fit applications listed in the fitment data.

Compatible Vehicles

• Fits 2004-2006 Audi S4, N/A
• Fits 2002-2005 Volkswagen Passat, N/A; Housing includes thermostat
• Fits 2000 Volkswagen Passat, N/A; Housing includes thermostat
• Fits 2000-2004 Audi A6 Quattro, N/A
• Fits 2004 Audi Allroad Quattro, N/A
• Fits 2003 Audi S8, N/A
• Fits 2001 Audi S8, N/A
• Fits 2000-2001 Audi A8 Quattro, N/A
• Fits 1992-1994 Audi 100, N/A
• Fits 1992-1994 Audi 100 Quattro, N/A
• Fits 1990-1992 Dodge Monaco, N/A; Thermostat located at water pump (inlet system)