Includes an OEM water pump, heat management module, and 1 gallon of coolant concentrate
10X Entries For Our 25th Anniversary Sweepstakes! For model years 2017-2019
Brand:
ES#:
4869783
Mfg#:
11518638026EKT
In Stock
ON SALE!
$395.99
This product was last offered at the strikethrough price on 05-02-2026
Also called a Heat Management Module by BMW, this electronic thermostat controls coolant flow based on engine temperatures
For models with the B48D, B46D, or B46X engines only - Not for the earlier Gen1 or later Gen3 engines
Brand:
ES#:
4179815
Mfg#:
11538642560
In Stock
9% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$446.99
This product was last offered at the strikethrough price on 07-06-2026
Also called a Heat Management Module, this electronic thermostat controls coolant flow based on engine temperatures
10X Entries For Our 25th Anniversary Sweepstakes! For models with the B48D, B46D, or B46X engines only - Not for the earlier Gen1 or later Gen3 engines
Brand:
ES#:
5433734
Mfg#:
11538642560
In Stock
ON SALE!
$356.99
This product was last offered at the strikethrough price on 05-02-2026
Includes the components needed to replace the two biggest B48 cooling issues, plus most of the "while you are in there" parts we highly recommend replacing - featuring an Aluminum Oil Filter Housing, Coolant Thermostat Module, and coolant pump assembly!
10X Entries For Our 25th Anniversary Sweepstakes! For vehicles without Energy Recovery System (S1CEA) For later models with the B48 Gen2 (B48D) engine only - Not compatible with earlier Gen1 engines
Brand:
ES#:
5425175
Mfg#:
G2XB48DOFHL2KT
Ships in 2 Business Days
ON SALE!
$1733.99
This product was last offered at the strikethrough price on 06-15-2026
Connects to the thermostat module and supports the electrical wiring harness
For models with the B48D, B46D, or B46X engines only - Not for the earlier Gen1 or later Gen3 engines
Brand:
ES#:
4179822
Mfg#:
11538651265
Ships in 1-2 days
4% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$78.99
This product was last offered at the strikethrough price on 03-04-2026
Feeds coolant from the water pump to the thermostat module
For models with the B48D, B46D, or B46X engines only - Not for the earlier Gen1 or later Gen3 engines
Brand:
ES#:
4179818
Mfg#:
11538650981
In Stock
8% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$109.99
This product was last offered at the strikethrough price on 08-21-2026
Includes the main components needed to replace the two biggest B48 cooling issues - featuring an upgraded Aluminum Oil Filter Housing and new Coolant Thermostat Module
10X Entries For Our 25th Anniversary Sweepstakes! For vehicles without Energy Recovery System (S1CEA) For later models with the B48 Gen2 (B48D) engine only - Not compatible with earlier Gen1 engines
Brand:
ES#:
5425168
Mfg#:
G2XB48DOFHL1KT
Ships in 6 Business Days
ON SALE!
SAVE 12%
$1106.99
This product was last offered at the strikethrough price on 06-15-2026
$971.45 USD
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on orders $49 and up
Partial Replacement
More About Engine Thermostat Parts
Your thermostat helps regulate engine temperatures by allowing the coolant to circulate through the radiator once it opens. If it fails, this might mean it never closes, but worst case, it could mean your coolant doesn't get to the radiator. Stay ahead of cooling issues by replacing your thermostat regularly with an OEM thermostat or quality aftermarket thermostat from our selection.
Partial Replacement
