Calorstat THS19094.80 Engine Coolant Thermostat

Engine Coolant Thermostat Overview

The Calorstat THS19094.80 engine coolant thermostat is an OEM-grade replacement built for precise coolant flow control and stable operating temperature. It opens at 176°F (80°C) and is listed for BMW M3, M5, and M6 applications with direct fitment coverage across the model years shown below.

Key Features

• OEM-grade standard thermostat for engine cooling system service
• Start-to-open temperature: 176°F / 80°C
• Sealing flange outside diameter: 2.87 in.
• Height between flanges: 1.45 in.
• By-pass valve diameter: 57.6 mm
• Valve-seat diameter: 73.0 mm
• Height, by-pass side: 37.0 mm
• No gasket or seal included

Detailed Description

Calorstat THS19094.80 is an engine coolant thermostat engineered to regulate coolant circulation at the specified opening temperature for BMW cooling systems. This thermostat is listed for 2008-2013 BMW M3, 2006-2010 BMW M5, and 2006-2010 BMW M6 applications, making it a direct-fit service part for vehicles that require an 80°C thermostat specification. The OEM grade construction supports accurate temperature control, while the listed dimensions help confirm housing and sealing compatibility during replacement. This part cross-references 2.409.79 and 459-174 for the same application.

Vehicle Fitment

• Fits 2008-2013 BMW M3, N/A. Opening Temp: 80 C / 176 F
• Fits 2006-2010 BMW M5, N/A. Opening Temp: 80 C / 176 F
• Fits 2006-2010 BMW M6, N/A. Opening Temp: 80 C / 176 F

Common Replacement Reasons

• Engine running hotter than normal
• Slow warm-up or unstable coolant temperature
• Temperature fluctuations during driving
• Thermostat sticking open or closed
• Cooling system service on BMW M3, M5, or M6 models

Installation Notes and Tips

Verify the thermostat opening temperature and housing dimensions before installation. Because no gasket or seal is included, reuse is not assumed and the correct sealing component should be selected separately if required by the application. Inspect the cooling system, housing surfaces, and coolant condition during service to help ensure proper sealing and temperature control.

Quality Assurance

Calorstat supplies OEM-grade cooling system components, and this thermostat is built to match the specified application requirements for BMW M3, M5, and M6 fitment. Confirm part number THS19094.80 against the vehicle’s cooling system specification before installation.