YzusGomumu 603-861 Coolant Expansion Reservoir with Cap — Fits 2016-2021 Cadillac XT4/XT5/XT6, Blazer, Equinox, Acadia, Terrain, LaCrosse, Regal | Replaces 23386455
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Description
xOverview
YzusGomumu 603-861 coolant expansion reservoir with cap is designed to support your cooling system across a wide range of driving conditions. By maintaining a steady coolant level, it helps your engine respond smoothly to warm days, cold starts, and spirited drives alike. This replacement part pairs a robust reservoir with a secure cap to keep the system sealed and efficient.
Key benefits
- Helps maintain optimal engine temperature across daily commutes and demanding drives
- Supports consistent coolant flow to reduce overheating-related symptoms
- Durable construction made to withstand extreme temperature fluctuations and system pressure
- Cap included for a complete, ready-to-install replacement
- OE reference 23386455 helps verify a correct fit for many GM models
- Cross-brand compatibility across Cadillac, Chevrolet, GMC, and Buick applications
Durability and fit
The unit’s rugged design emphasizes long-term reliability in the engine bay. It’s built from quality materials intended to resist cracking or warping under heat and vibration, while maintaining a tight seal to protect the cooling system from leaks.
In typical use, drivers may notice a steadier engine feel and a more predictable cooling rhythm. For hot climates or when hauling cargo, the reservoir supports sustained coolant circulation so the radiator can respond quickly to rising temps. This can translate to more confident throttle response and smoother idling during peak heat.
Compatibility and how to verify
Compatible with 2016-2021 Cadillac XT4/XT5/XT6, 2016-2021 Chevrolet Blazer/Equinox, 2016-2021 GMC Acadia/Terrain, and 2018-2020 Buick LaCrosse/Regal Sportback; check OE number 23386455 to confirm a match.
What’s included
- Coolant expansion reservoir tank
- Cap
FAQ
Q: What vehicles are compatible with the YzusGomumu 603-861 Coolant Expansion Reservoir?
A: Fits 2016-2021 Cadillac XT4/XT5/XT6, Chevrolet Blazer/Equinox, GMC Acadia/Terrain, Buick LaCrosse/Regal Sportback; verify OE 23386455.
Q: Does the package include a cap and how durable is the reservoir?
A: Yes, the cap is included; the reservoir is built to resist temperature changes and system pressure for reliable performance.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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