Calorstat TH5077.88 Engine Coolant Thermostat

Engine Coolant Thermostat for OE-Style Cooling Control

Calorstat TH5077.88 is a standard engine coolant thermostat built for precise coolant flow control and stable operating temperature. With a 190.0°F start-to-open temperature, it supports proper warm-up and temperature regulation in Ford Transit-150, Transit-250, Transit-350, and Transit-350 HD applications, as well as select Toyota 4Runner and Pickup models.

Key Features

• Standard engine coolant thermostat design
• Start to open temperature: 190.0°F
• Sealing flange outside diameter: 2.04 in.
• Height between flanges: 1.33 in.
• Gasket or seal included: No
• Calorstat TH5077.88 for OE-style cooling system service

Detailed Description

This Calorstat engine coolant thermostat is specified for cooling system service where accurate temperature control matters. The 190°F opening point helps regulate coolant circulation once the engine reaches operating temperature, supporting consistent heater performance and stable engine operation. Calorstat TH5077.88 is listed for 2015-2019 Ford Transit-150, Transit-250, Transit-350, and Transit-350 HD, plus select Toyota 4Runner and Toyota Pickup applications. This part cross-references Ford and Land Rover applications such as BK2Q8A586AB and LR004618 for the same application.

What It Helps Address

• Engine running too cool or taking too long to warm up
• Temperature fluctuation caused by a worn thermostat
• Reduced cabin heat output during cold starts
• Cooling system service on Ford Transit and Toyota truck/SUV platforms
• Replacement of a thermostat that no longer opens at the correct temperature

Installation Notes and Tips

Inspect the thermostat housing, sealing surfaces, and coolant condition before installation. Because a gasket or seal is not included, verify the correct sealing component is on hand before service. Confirm the thermostat orientation and opening temperature match the vehicle specification before reassembly. Fits 2015-2019 Ford Transit-150, N/A; Fits 2015-2019 Ford Transit-250, N/A; Fits 2015-2019 Ford Transit-350, N/A; Fits 2015-2019 Ford Transit-350 HD, N/A; Fits 1995 Toyota 4Runner, N/A; Fits 1988-1989 Toyota 4Runner, N/A; Fits 1995 Toyota Pickup, N/A; Fits 1988-1989 Toyota Pickup, N/A; Fits 1981-1985 Toyota Pickup, N/A.

Quality Assurance

Calorstat cooling system components are built to meet OE-style service requirements for temperature control and fitment consistency. Verify part number TH5077.88 against the vehicle application before installation.