Keep the coolant flowing with a properly functioning thermostat
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
Brand:
ES#:
4043114
Mfg#:
2742000115
In Stock
ON SALE!
$151.99
This product was last offered at the strikethrough price on 05-02-2026
Includes a Genuine Mercedes-Benz Water Pump, Thermostat, and 1 gallon of pink G40 coolant concentrate.
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms Not for cars with (Code 806, 807, 808, 809, 920 or M014).
Brand:
ES#:
4906328
Mfg#:
2742000900KT
Ships in 4 Business Days
$595.99
This product was last offered at the strikethrough price on 01-05-2026
Premium Metal Construction vs OEM Plastic; Includes Thermostat & Sensor with Hardware
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For cars with (Code M014); Not for cars with (Code 920)
Engine Coolant Thermostat / Water Inlet Assembly
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms For cars with (Code M014); Not for cars with (Code 920)
Brand:
ES#:
4049225
Mfg#:
2742003400
Ships in 1 Business Day
7% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$234.00
This product was last offered at the strikethrough price on 01-06-2026
Includes housing & seals
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms We Price Match - Give Us A Call or Chat! Not for cars with (Code 920, or M014).
Engine Coolant Thermostat / Water Inlet Assembly
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms We Price Match - Give Us A Call or Chat! For cars with (Code M014); Not for cars with (Code 920)
Includes housing & seals
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms We Price Match - Give Us A Call or Chat! Not for cars with (Code 920, or M014).
Includes an OEM supplier Water Pump, Thermostat, and 1 gallon of pink G40 coolant premixed 50/50.
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! Not for cars with (Code 806, 807, 808, 809, 920 or M014).
Brand:
ES#:
4906352
Mfg#:
2742000900KT1
Ships in 1-2 days
$355.99
This product was last offered at the strikethrough price on 05-07-2026
$350.99 USD
Free Shipping
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.
Lifetime Replacement
