Located on the lower side of the radiator
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Three way connector that attaches directly to the upper radiator hose
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Monitors coolant temperature for fan control & gauge readings
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Brand:
ES#:
4151257
Mfg#:
1K0121109AK
Ships in 3 Business Days
$19.99
This product was last offered at the strikethrough price on 10-22-2026
Includes sealing O-Ring
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Ensure a proper seal when installing your new thermostat. 50x3.5mm
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Ensure a proper seal when installing a new water pump. 53x4mm
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 AUG or AWM engine codes only.
Connects quick connect and adapter piece
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Brand:
ES#:
342850
Mfg#:
3C0121101H
Ships in 1 Business Day
$27.99
This product was last offered at the strikethrough price on 05-07-2026
For the belt driven auxiliary fan
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Keep your cooling system efficient
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Connects the lower radiator port to the water pump and expansion tank
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Brand:
ES#:
3463131
Mfg#:
4B0121055F
In Stock
ON SALE!
SAVE 36%
$41.99
This product was last offered at the strikethrough price on 05-02-2026
Includes a genuine 87�C thermostat, housing, o-ring and stretch bolts
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Brand:
ES#:
2580971
Mfg#:
030121121BKT1
In Stock
ON SALE!
SAVE 28%
$36.99
This product was last offered at the strikethrough price on 05-02-2026
Connects the lower radiator port to the thermostat housing
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 VIN from 3B-X-145 414 or VIN 3B-XE173 716 through VIN 3B-1-050 000 only, splits are in the 1999 and 2001 model years
Brand:
ES#:
2627317
Mfg#:
8D0121055T
Ships in 3 Business Days
$37.99
This product was last offered at the strikethrough price on 10-22-2026
Connects lower radiator port to the thermostat housing
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 AHA engine code with VIN up to 3B-X-145 413 or 3B-XE173 715 only, split is in the 1999 model year
Optimize your engine cooling system performance and heater output with quality drive belts, coolant hoses, cooling system parts, and approved coolant fluids from ECS Tuning. Head off expensive repairs and untimely breakdowns with regularly scheduled cooling system inspection and maintenance.
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Volkswagen
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