Motorad 544-189 Engine Coolant Thermostat

Motorad 544-189 Engine Coolant Thermostat

Motorad 544-189 is a standard engine coolant thermostat built to OE specifications for precise coolant temperature control. It uses OEM-quality materials and a copper case with wax compound for quick response to temperature changes in the cooling system.

Compatible With BMW 328d, BMW 328d xDrive, BMW X5, BMW 740Le xDrive, BMW X3, BMW 535d, BMW 535d xDrive, and BMW 740Ld xDrive applications across 2014-2018 model years.

Key Features

• OEM insert design for direct thermostat housing service
• Start-to-open temperature: 189°F (87.22°C)
• Plastic and steel construction with black and silver finish
• O-ring seal type with included gasket or seal
• OEM grade thermostat built to OE supplier standards
• Motorad 544-189 cross-references Dorman OE Solutions 544-189

Product Details

This thermostat regulates coolant flow to help the engine reach and maintain the correct operating temperature. The OE-style insert design, copper case, and wax compound support fast reaction to coolant temperature changes, which is important in BMW diesel and hybrid cooling systems that demand stable thermal control. Motorad Standard 544-189 is a direct-fit service part for select BMW 328d, X5, X3, 535d, 740Le xDrive, and 740Ld xDrive models.

Motorad’s Standard product line focuses on OE-spec replacement cooling components for routine service and repair. For buyers searching for a BMW thermostat replacement, BMW coolant thermostat, or Motorad 544-189 thermostat for 2014-2018 BMW diesel applications, this part matches the listed fitment and temperature specification.

What It Helps Address

• Engine running too cool or too hot
• Delayed warm-up after cold starts
• Temperature fluctuation in the cooling system
• Thermostat-related check engine or cooling performance concerns
• Service replacement for worn OE thermostat inserts

Installation Notes

Verify the thermostat housing style and engine application before installation. Replace the sealing surface as required and confirm the O-ring seal is properly seated during assembly. Follow the vehicle service procedure for coolant refill and bleeding after installation to prevent trapped air in the system.

Quality Assurance

Manufactured by an OE supplier using OEM-quality materials and processes, this thermostat is built to meet OEM specifications and safety standards. The copper case and wax compound are selected for responsive operation in demanding automotive cooling systems.

Fits 2014-2018 BMW 328d, N/A; Fits 2014-2018 BMW 328d xDrive, N/A; Fits 2014-2018 BMW X5, N/A; Fits 2017 BMW 740Le xDrive, N/A; Fits 2015-2017 BMW X3, N/A; Fits 2014-2016 BMW 535d, N/A; Fits 2014-2016 BMW 535d xDrive, N/A; Fits 2015 BMW 740Ld xDrive, N/A.