Mounts on radiator to determine coolant temperature for fan operation
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Stop coolant loss and cure a fogged windshield
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<font color='blue'>Blue</font> sensor with square connector. Please check existing sensor color
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! Up to VIN 8D-X-500000, split is in the 1999 model year
Ensure a proper seal when installing a new water pump
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Updated green 4 pin sensor, replaces old blue sensors. For vehicles with square connector.
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Connects the oil cooler to the hard water tube
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Common source of leaks, mounted between your oil filter and engine block
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Brand:
ES#:
4939990
Mfg#:
078117021A
In Stock
ON SALE!
SAVE 22%
$36.99
This product was last offered at the strikethrough price on 05-02-2026
Connects the lower radiator port to the thermostat housing
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 From VIN 8D -X-003501, split is in the 1999 model year
Connects the oil cooler to the upper coolant pipe
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 Up to the 1999 model year
Located on the lower side of the radiator
5X 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!
Includes sealing O-Ring
5X 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! Lower temperature thermostat, stock is 87°C
Plastic pressure cap for expansion tank
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Located on the back of the cylinder head
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Includes integrated coolant level sensor
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 Up to VIN 8D-W-007799, split is in the 1998 model year
For the belt driven auxiliary fan
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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.
Lifetime Replacement
