Four Seasons 85991 Engine Coolant Thermostat Housing

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Thermostat Housing

Four Seasons 85991 Engine Coolant Thermostat Housing

Brand	Four Seasons 85991
Bolt Hole Center To Bolt Hole Center	1.565
Description	Engine Coolant Components
Flange Thickness	0.408
Gasket Or Seal Included	Not Included
Inlet Port Diameter	1.536
Material	Plastic
Meets / Exceeds OEM?	Yes
Overall Height IN	5.500
Style	w/ Thermostat
Thermostat Included?	Included
Type	Integrated Thermostat Housing
Product line	Thermostat Housing
Fits	BMW · 82 vehicles

OE direct replacement. Integrated thermostat housing meets OEM requirements for a precise fit.

Plastic construction. Lightweight design for dependable coolant system service.

Thermostat included. Convenient all-in-one housing simplifies replacement.

Cross-references Febi-Bilstein 34788, Four Seasons 85991 and Genuine 11537633476 for the same application. See all 15.

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Free returns within 60 days if it doesn't fit when fitment is verified.

Not what you need? See all Engine Coolant Thermostat Housing options

Thermostat Housing for BMW Cooling Systems

Four Seasons 85991 is an integrated engine coolant thermostat housing built from plastic and supplied with the thermostat already included. It is made to meet or exceed OEM requirements and is listed for a wide range of BMW applications, including BMW 320i, X1, X3, X4, and X5 models.

The Four Seasons Thermostat Housing line focuses on direct-fit engine coolant components for repair work that needs accurate coolant flow control and a proper housing-to-thermostat assembly. Part number 85991 is a practical OE-style replacement for BMW cooling system service.

Key Features

Integrated thermostat housing design
Thermostat included
Plastic construction
Gasket or seal not included
Meets or exceeds OEM specifications
Engine coolant component for BMW cooling system repair
Four Seasons 85991 thermostat housing for direct replacement service

Detailed Description

Four Seasons 85991 is an engine coolant thermostat housing with an integrated thermostat, built for BMW cooling system applications that require a matched housing and thermostat assembly. The housing uses a plastic body with an inlet port diameter of 1.536 inches, a flange thickness of 0.408 inches, an overall height of 5.500 inches, and a bolt hole center-to-center measurement of 1.565 inches. This part cross-references Genuine 11537633476 for the same application.

Use this thermostat housing on confirmed BMW fitments including 2012-2018 BMW 320i, 320i xDrive, 228i, 228i xDrive, 328i, 328d, 428i, 528i, X1, X3, X4, X5, X2, and Z4 applications listed below. Four Seasons 85991 is also referenced under Febi-Bilstein 34788 and NGK 49618.

Vehicle Fitment

Fits 2018 BMW 320i, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2013-2015 BMW 320i, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2018 BMW 320i xDrive, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2013-2015 BMW 320i xDrive, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2018 BMW X1, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2013-2015 BMW X1, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2018 BMW X2, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2018 BMW X4, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2015 BMW X4, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2018 BMW X5, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2016-2017 BMW 320i, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016-2017 BMW 320i xDrive, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016-2017 BMW X1, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016-2017 BMW X3, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016-2017 BMW X4, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016-2017 BMW X5, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 228i, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 228i xDrive, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 328d, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 328d xDrive, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 328i, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 328i GT xDrive, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 328i xDrive, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 428i, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 428i Gran Coupe, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 428i xDrive, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 428i xDrive Gran Coupe, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 528i, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW 528i xDrive, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2016 BMW Z4, N/A; engine coolant thermostat housing includes thermostat and housing.
Fits 2014-2015 BMW 228i, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2015 BMW 228i xDrive, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2014-2015 BMW 328d, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2014-2015 BMW 328d xDrive, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2012-2015 BMW 328i, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2014-2015 BMW 328i GT xDrive, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2013-2015 BMW 328i xDrive, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2014-2015 BMW 428i, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2015 BMW 428i Gran Coupe, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2014-2015 BMW 428i xDrive, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2015 BMW 428i xDrive Gran Coupe, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2012-2015 BMW 528i, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2012-2015 BMW 528i xDrive, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2013-2015 BMW X3, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2012-2015 BMW Z4, N/A; thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.
Fits 2012 BMW X1, N/A; w/ Thermostat.

Installation Notes and Tips

Confirm the OE number and vehicle application before installation, especially on BMW cooling systems with multiple housing variations. Inspect the mating surfaces, replace the gasket or seal separately since it is not included, and verify the inlet port and bolt pattern match the original part before reassembly.

Quality Assurance

Four Seasons lists this thermostat housing as meeting or exceeding OEM specifications. The part number 85991 is built as an OE-style engine coolant component for direct-fit cooling system service on confirmed BMW applications.

This part fits 82 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Submodel	Liters	Cylinders	Position	Notes
2018	BMW	320i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2018	BMW	320i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2018	BMW	X1	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2018	BMW	X1	xDrive28i	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2018	BMW	X2	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2018	BMW	X2	xDrive28i	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2018	BMW	X4	xDrive28i	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2018	BMW	X5	xDrive40e	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2017	BMW	320i	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2017	BMW	320i xDrive	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2017	BMW	X1	—	2.0L	L4	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2017	BMW	X3	—	2.0L	L4	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2017	BMW	X4	—	2.0L	L4	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2017	BMW	X5	—	2.0L	L4	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	228i	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	228i xDrive	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	320i	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	320i xDrive	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	328d	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	328d xDrive	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	328i	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	328i GT xDrive	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	328i xDrive	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	428i	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	428i Gran Coupe	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	428i xDrive	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	428i xDrive Gran Coupe	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	528i	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	528i xDrive	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	X1	—	—	—	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	X3	—	2.0L	L4	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	X4	—	2.0L	L4	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	X5	—	2.0L	L4	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2016	BMW	Z4	—	2.0L	L4	N/A	Engine Coolant Thermostat Housing includes thermostat and housing.; Thermostat Housing
2015	BMW	228i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	228i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	320i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	320i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	328d	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	328d xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	328i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	328i GT xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	328i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	428i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	428i Gran Coupe	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	428i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	428i xDrive Gran Coupe	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	528i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	528i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	X1	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	X3	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	X4	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2015	BMW	Z4	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	228i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	320i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	320i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	328d	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	328d xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	328i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	328i GT xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	328i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	428i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	428i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	528i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	528i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	X1	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	X3	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2014	BMW	Z4	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2013	BMW	320i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2013	BMW	320i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2013	BMW	328i	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2013	BMW	328i xDrive	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2013	BMW	528i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2013	BMW	528i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2013	BMW	X1	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2013	BMW	X3	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2013	BMW	Z4	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2012	BMW	328i	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2012	BMW	528i	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2012	BMW	528i xDrive	—	—	—	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
2012	BMW	X1	—	2.0L	L4	N/A	w/ Thermostat; Thermostat Housing
2012	BMW	Z4	—	2.0L	L4	N/A	Thermostat included in Engine Coolant Thermostat/Water Outlet Assembly Kit.; Thermostat Housing
No rows match your filter.

Directly replaces or cross-references 15 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

Febi-Bilstein — 34788Four Seasons — 85991Genuine — 11537633476NGK — 496188158118222269025135115375882571153763347711538635689115386365941153863659511538648791TM25108W98521