Install new hardware with your new parts. M7x21.5mm
2X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply We Price Match - Give Us A Call or Chat!
Brand:
ES#:
4151982
Mfg#:
N90945002
In Stock
$5.99
This product was last offered at the strikethrough price on 10-18-2026
Install new hardware with your new parts. M7x21.5mm
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Brand:
ES#:
6661
Mfg#:
N90945002
In Stock
Limited Qty Sale
29% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$8.49
This product was last offered at the strikethrough price on 10-27-2026
Maintain proper operating temperature with a new thermostat, housing and hardware
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply For vehicles with ALH engine code only
Brand:
ES#:
2954030
Mfg#:
038121121KT
Ships in 2 Business Days
$105.99
This product was last offered at the strikethrough price on 08-31-2026
Bring your car to operating temperature.
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Brand:
ES#:
5335359
Mfg#:
044121113
In Stock
ON SALE!
SAVE 15%
$14.99
This product was last offered at the strikethrough price on 09-16-2026
Maintain proper operating temperature with a new thermostat, housing and hardware
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply For vehicles with BEW engine code only
Brand:
ES#:
2954031
Mfg#:
038121121DKKT
Ships in 2 Business Days
$127.99
This product was last offered at the strikethrough price on 08-31-2026
Bring your car to operating temperature.
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply We Price Match - Give Us A Call or Chat!
Brand:
ES#:
6391
Mfg#:
044121113
In Stock
$25.59
This product was last offered at the strikethrough price on 10-26-2026
Ensure a proper seal when installing your new thermostat. 50x4
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Keep your car running at the proper temperature. Does not include o-ring
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Brand:
ES#:
276208
Mfg#:
044121113
Ships in 2 Business Days
8% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$72.99
This product was last offered at the strikethrough price on 08-03-2026
Recommended when changing the thermostat
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply We Price Match - Give Us A Call or Chat!
Common point of failure or leaking for the cooling system on your TDI.
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply For vehicles with ALH engine code only
Brand:
ES#:
275130
Mfg#:
038121121
In Stock
29% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$27.99
This product was last offered at the strikethrough price on 10-27-2026
Keep your car running at the proper temperature.
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply Not compatible with the iABED aluminum thermostat housing (ES3553337).
Brand:
ES#:
261793
Mfg#:
044121113
Ships on Nov 19, 2026
$29.27
This product was last offered at the strikethrough price on 09-22-2026
Maintain proper operating temperature with a new thermostat, housing and hardware
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply For vehicles with ALH engine code only
Brand:
ES#:
2954033
Mfg#:
038121121KT2
Ships in 1 Business Day
ON SALE!
SAVE 29%
$27.99
This product was last offered at the strikethrough price on 05-02-2026
Common source of coolant leaks around your thermostat
2X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply We Price Match - Give Us A Call or Chat!
Common point of failure for the cooling system on your TDI
2X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply We Price Match - Give Us A Call or Chat! For vehicles with BEW engine code only
Ensure a proper seal when installing your new thermostat. 50x4
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Common point of failure for the cooling system on your TDI
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply For vehicles with BEW engine code only
Brand:
ES#:
275132
Mfg#:
038121121D
Ships in 1 day
15% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$47.99
This product was last offered at the strikethrough price on 08-31-2026
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.
Lifetime Replacement
