Four Seasons 85541 Engine Coolant Outlet Flange

BMW Coolant Flange Replacement

Four Seasons 85541 is an engine coolant outlet flange for BMW cooling system service. Built from plastic with a gasket or seal included, it is a direct-fit style replacement for select BMW Z3, 3 Series, 5 Series, and M3 applications where the coolant outlet flange needs attention.

Four Seasons coolant flange line parts are made for cooling system repair work that demands correct port layout, thermostat lip support, and OE-style fitment. Part number 85541 meets or exceeds OEM requirements and is designed for BMW coolant flange applications across multiple model years.

Key Features

• Engine coolant outlet flange for BMW cooling system repair
• Plastic construction for OE-style replacement fit
• Gasket or seal included
• Lip for thermostat: yes
• Style: without thermostat
• Meets or exceeds OEM requirements
• Hose barb outlet attachment type
• Four mounting holes / four bolt holes

Detailed Description

Four Seasons 85541 is an engine coolant components part used to route coolant through the cooling system at the outlet flange location. The design includes two outlets and a thermostat lip, while mounting hardware is not included. This coolant flange is a practical replacement for aging plastic flanges that can crack, leak, or lose sealing integrity over time. It is a fitment-based solution for BMW cooling system service, including BMW Z3, BMW 323i, BMW 328i, BMW 325i, BMW 525i, and BMW M3 applications.

This part cross-references Motorad 5541KT for the same application.

What It Helps Fix

• Coolant leaks at the flange or sealing surface
• Cracked or brittle plastic coolant outlet housing
• Loss of coolant from a damaged hose barb connection
• Improper sealing at the thermostat flange area
• Cooling system service on BMW Z3, 3 Series, 5 Series, and M3 models

Installation Notes

Verify the flange style, outlet layout, and thermostat-lip configuration before installation. Replace the seal during service, clean the mating surface thoroughly, and inspect connected hoses for wear or hardening. Because mounting hardware is not included, reuse or source the correct fasteners as needed for the vehicle.

Compatible With: Fits 1997-2001 BMW Z3, coolant flange; Fits 1999 BMW 323i, old body style HVAC heater core fitment; coolant flange; Fits 1999 BMW 323is, old body style HVAC heater core fitment; coolant flange; Fits 1999 BMW 323ti, old body style HVAC heater core fitment; coolant flange; Fits 1999 BMW 328i, old body style HVAC heater core fitment; coolant flange; Fits 1999 BMW 328is, old body style HVAC heater core fitment; coolant flange; Fits 1995-1999 BMW M3, coolant flange; Fits 1998 BMW 323i, coolant flange; Fits 1998 BMW 323is, coolant flange; Fits 1996-1998 BMW 328i, coolant flange; Fits 1996-1998 BMW 328is, coolant flange; Fits 1994-1995 BMW 325i, coolant flange; Fits 1987-1992 BMW 325i, coolant flange; Fits 1994-1995 BMW 325is, coolant flange; Fits 1987-1992 BMW 325is, coolant flange; Fits 1989-1995 BMW 525i, coolant flange; Fits 1993 BMW 525iT, coolant flange; Fits 1988-1991 BMW 325iX, coolant flange; Fits 1982-1988 BMW 528e, coolant flange; Fits 1984-1987 BMW 325e, coolant flange; Fits 1986-1987 BMW 325es, coolant flange.

Quality Assurance

Four Seasons 85541 is listed as meeting or exceeding OEM requirements for the specified BMW applications. The part number 85541 is supported by interchange references and fitment data for cooling system repair accuracy.