Beck Arnley 143-0891 Engine Coolant Thermostat

Beck Arnley 143-0891 Engine Coolant Thermostat

Beck Arnley 143-0891 is an engine coolant thermostat built to foreign nameplate OE specifications for form, fit, and function. It is a direct-fit cooling system service part for BMW applications that require the original equipment temperature rating and includes the gasket/seal.

Key Features

• Engine coolant thermostat for BMW cooling system service
• Original equipment temperature rating: 221
• Housing included
• Includes gasket/seal
• OE-style fitment from Beck Arnley for foreign nameplate applications

Detailed Description

This Beck Arnley thermostat, part number 143-0891, is specified for BMW 540i, BMW 740i, and BMW 740iL applications that call for a 221-degree thermostat. Beck Arnley sources parts to match OE form, fit, and function, helping maintain proper coolant flow and engine operating temperature in the vehicle’s cooling system. If you are replacing a thermostat on a 1997-1998 BMW 540i or 740i, or a 1996-1998 BMW 740iL, this part number 143-0891 matches the listed original equipment temperature requirement.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Engine running too cool or too hot
• Delayed warm-up after cold starts
• Temperature fluctuation from a worn thermostat
• Coolant flow control issues in the BMW cooling system
• Replacement of a thermostat with the correct OE temperature rating

Installation Notes and Tips

Verify the OE temperature specification before installation and confirm the application by year, make, and model. For BMW 540i and BMW 740i service, this thermostat is listed for 1997-1998 models; for BMW 740iL, it is listed for 1996-1998 models. Inspect the sealing surfaces, clean the housing area, and refill the cooling system with the correct coolant after installation. Bleed air from the system according to factory service procedures to help prevent overheating or erratic temperature readings.

Quality Assurance

Beck Arnley parts are sourced to meet foreign nameplate OE specifications for form, fit, and function. That OE-focused approach supports confident installation on the listed BMW applications.