Calorstat TH5075.82 Engine Coolant Thermostat

Engine Coolant Thermostat for Import Applications

The Calorstat TH5075.82 engine coolant thermostat is a standard replacement thermostat built around an off-set valve seat design and an 180°F opening temperature. It is specified for a wide range of import and domestic vehicles, including Mazda Miata, Kia Rio, and Mitsubishi Mirage applications.

Key Features

• Standard engine coolant thermostat design
• Off-set valve seat for application-specific cooling system fitment
• Starts to open at 180°F / 82°C
• Sealing flange outside diameter: 2.04 in.
• Height between flanges: 0.74 in.
• Gasket or seal not included
• Part number: TH5075.82

Detailed Description

Calorstat TH5075.82 is an engine coolant thermostat selected for vehicles that use an 82°C / 180°F opening point to regulate coolant flow through the engine. Its off-set valve seat design and compact flange dimensions support proper housing fitment in many Asian and domestic cooling systems. This thermostat cross-references Stant 45868 and Four Seasons 33198 for the same application. Common fitment includes 2001-2005 Mazda Miata, 2004-2005 Kia Rio, 2000-2004 Kia Spectra, and 2017 Mitsubishi Mirage. The TH5075.82 part number is also listed across multiple interchange references for broad catalog matching.

What It Helps Address

• Engine running too cool because the thermostat is stuck open
• Overheating caused by delayed coolant flow regulation
• Temperature fluctuation during warm-up and normal driving
• Cooling system service on high-mileage Mazda, Kia, Mitsubishi, Suzuki, and Dodge vehicles
• Replacement of a thermostat with the correct 180°F opening specification

Installation Notes and Tips

Verify housing style, flange dimensions, and opening temperature before installation. Because a gasket or seal is not included, reuse is not recommended unless the existing seal is confirmed serviceable and the housing design allows it. Clean the thermostat housing mating surfaces thoroughly and refill the cooling system with the correct coolant mixture after installation. Confirm proper bleed procedure to remove trapped air and check for leaks once the engine reaches operating temperature. Fits 2001-2005 Mazda Miata, N/A; Fits 2004-2005 Kia Rio, N/A; Fits 2017 Mitsubishi Mirage, N/A.

Quality Assurance

Calorstat cooling system components are cataloged for OE-style replacement use across a broad range of vehicle applications. The TH5075.82 is listed with extensive interchange coverage and application-specific fitment data to support accurate parts matching for service work.