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Heating and Cooling› Thermostats, Housings and Fillers

ACDelco

Engine Coolant Thermostat

$34.70 $21.97 Save $12.73

SKU: 12T121D

In Stock
In Stock
Ships by Jul 29
Free Shipping
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The ACDelco 12T121D is a Professional Series engine coolant thermostat designed to control the flow of coolant through the radiator. It helps your vehicle's engine reach and maintain its optimal operating temperature. This premium aftermarket replacement provides the performance and dependability expected from ACDelco and is manufactured to meet expectations for fit, form, and function.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandACDelco
Part Number12T121D
CategoryHeating and Cooling

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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