Heating and Cooling› Thermostats, Housings and Fillers

Pontiac

Engine Coolant Thermostat/Water Inlet Assembly

$30.95

SKU: 15-11057

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The ACDelco 15-11057 Engine Coolant Thermostat/Water Inlet Assembly is designed to regulate coolant flow for optimal engine temperature and performance. It guarantees a perfect fit for various GM vehicles, including Buick, Cadillac, Chevrolet, and GMC.
Show original supplier description
The ACDelco 15-11057 Engine Coolant Thermostat/Water Inlet Assembly is engineered to regulate coolant flow, ensuring your engine reaches and maintains its optimal operating temperature. This assembly includes the thermostat and water inlet housing, which connects the radiator hoses. For certain applications, the water inlet may also contain ports for sensors and switches. This GM Original Equipment part is manufactured to meet the high standards and specifications of General Motors, providing the same performance, durability, and service life as the original component. The steel thermostat material and included gasket ensure a reliable seal. This thermostat assembly is compatible with a wide range of GM vehicles. Specific fitments include various models of Buick Rainier, Cadillac Escalade (including ESV), Cadillac CTS, Chevrolet Corvette, Chevrolet Camaro, Chevrolet Silverado (1500, 2500 HD), Chevrolet Tahoe, and GMC Envoy (including XL). It is also listed for the Pontiac GTO and GMC Sierra models. Always use a vehicle selector tool to verify precise fitment for your specific application.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandPontiac
Part Number15-11057
CategoryHeating and Cooling
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

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Returns & Fitment

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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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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