Calorstat TH7287.87 Engine Coolant Thermostat

Engine Coolant Thermostat for BMW Diesel Applications

Calorstat TH7287.87 is a standard engine coolant thermostat built for BMW diesel cooling systems that require precise temperature control. With a start-to-open temperature of 188.0 degrees and a sealing flange outside diameter of 1.57 inches, this thermostat supports stable coolant flow and consistent operating temperature in the applications listed below.

• Standard engine coolant thermostat for BMW cooling system service
• Start to open temperature: 188.0 degrees
• Sealing flange outside diameter: 1.57 inches
• Direct interchange reference: 11518512234
• Calorstat TH7287.87 for OE-style thermostat replacement

Fitment Coverage

• Fits 2014-2018 BMW 328d, N/A. Vernet is an OE Supplier to BMW.
• Fits 2014-2018 BMW 328d xDrive, N/A. Vernet is an OE Supplier to BMW.
• Fits 2014-2018 BMW X5, N/A. Vernet is an OE Supplier to BMW.
• Fits 2015-2017 BMW X3, N/A. Vernet is an OE Supplier to BMW.
• Fits 2014-2016 BMW 535d, N/A. Vernet is an OE Supplier to BMW.
• Fits 2014-2016 BMW 535d xDrive, N/A. Vernet is an OE Supplier to BMW.
• Fits 2015 BMW 740Ld xDrive, N/A. Vernet is an OE Supplier to BMW.

Detailed Description

This Calorstat TH7287.87 engine coolant thermostat is specified for BMW diesel models including the 328d, 328d xDrive, X5, X3, 535d, 535d xDrive, and 740Ld xDrive. The 188.0-degree opening point helps regulate coolant circulation as the engine reaches operating temperature, while the standard design and 1.57-inch sealing flange diameter support proper housing fitment in the listed applications. If you are replacing a BMW thermostat with OE-style specifications, TH7287.87 is a direct service part to compare against the original 11518512234 reference. This part cross-references 11518512234 for the same application.

Common Problems This Part Can Address

• Engine running cooler or hotter than expected
• Delayed warm-up after a cold start
• Temperature fluctuation during normal driving
• Cooling system service on BMW diesel models
• Replacement of a thermostat that no longer opens at the correct temperature

Installation Notes and Tips

Verify the thermostat housing, sealing surface, and coolant passages before installation. Match the part number and opening temperature to the original specification for your BMW 328d, X5, X3, 535d, or 740Ld xDrive application. After installation, refill and bleed the cooling system according to BMW service procedures to remove trapped air and confirm stable operating temperature.

Quality Assurance

Calorstat is part of the Vernet thermostat line, and Vernet is identified as an OE supplier to BMW. That OE-supplier background supports application accuracy for BMW cooling system service and replacement.