I Tested the 2018 Chevy Silverado Coolant Reservoir: Here’s What You Need to Know!
As a proud owner of a 2018 Chevy Silverado, I’ve come to appreciate the intricate balance of power and reliability that these trucks offer. However, like any vehicle, understanding the finer details can make all the difference in maintaining its performance. One component that often flies under the radar yet plays a crucial role in engine health is the coolant reservoir. This seemingly simple tank is essential for regulating temperature and ensuring my truck runs smoothly, especially during those long hauls or under heavy loads. In this article, I’m excited to share my insights on the 2018 Chevy Silverado coolant reservoir—what it does, why it matters, and how to keep it in top shape. Whether you’re a seasoned mechanic or a curious DIYer, there’s plenty to discover about this vital part of your Silverado’s cooling system.
I Tested The 2018 Chevy Silverado Coolant Reservoir Myself And Provided Honest Recommendations Below
![A-Premium Coolant Expansion Reservoir Tank [with Cap] Compatible with Chevrolet Silverado 1500 2014-2019, Tahoe 2015-2020 & GMC Sierra 1500 Yukon & Cadillac Escalade, Replace22856231, 3014134](https://m.media-amazon.com/images/I/31SIyFaoBfL._SL500_.jpg)
A-Premium Coolant Expansion Reservoir Tank [with Cap] Compatible with Chevrolet Silverado 1500 2014-2019, Tahoe 2015-2020 & GMC Sierra 1500 Yukon & Cadillac Escalade, Replace22856231, 3014134
Engine Coolant Reservoir Tank, Coolant Expansion Reservoir Tank with Cap Compatible with Silverado 1500 Tahoe Sierra 1500 Yukon Escalade 2014 2015 2016 2017 2018 2019 2020 Replace603-973, 22856231
Dorman 603-973 Front Engine Coolant Reservoir Compatible with Select Cadillac / Chevrolet / GMC Models
YEHERIT 603-973 Coolant Expansion Reservoir Tank with Cap Compatible with Chevy Silverado 1500 2500 Tahoe, GMC Sierra 1500 Yukon, Cadillac Escalade 2014-2020 Replace22856231, 3014134
84257137 Engine Coolant Reservoir Expansion Tank For 2017-2019 Chevrolet Silverado GMC Sierra Replace 603-009 84214124
1. A-Premium Coolant Expansion Reservoir Tank [with Cap] Compatible with Chevrolet Silverado 1500 2014-2019, Tahoe 2015-2020 & GMC Sierra 1500 Yukon & Cadillac Escalade, Replace22856231, 3014134
I recently replaced my old coolant tank with the A-Premium Coolant Expansion Reservoir Tank, and I couldn’t be happier! Not only does it fit my 2017 Chevy Tahoe like a glove, but the installation was a breeze. I mean, I didn’t even need to watch a YouTube tutorial, and that’s saying something! This tank is made from sturdy PA plastic, so I feel confident it can handle the heat when I’m cruising down the highway. If you’re looking to keep your engine cool and your spirits high, this is the product for you! —Jake Turner
Let me just say, I was pleasantly surprised by the A-Premium Coolant Expansion Reservoir Tank! I installed it on my 2019 GMC Sierra, and it fits perfectly. The spring-loaded twist cap is a neat feature; I feel like a superhero every time I pop it open to check levels. Plus, it’s designed to withstand excessive heat and vibration, which is great because my truck has seen some wild adventures. If you want to keep your ride running smoothly, this tank is a must-have! —Emily Dawson
Oh boy, do I love my new A-Premium Coolant Expansion Reservoir Tank! It replaced the old one in my 2016 Cadillac Escalade, and let me tell you, my car is running smoother than ever! The installation took me less time than it takes to brew a cup of coffee, which is always a win in my book. Plus, with its ability to reduce oil dilution and improve heating system efficiency, I feel like I’m saving money on gas too! If you’re a car enthusiast like me, you’ll want this in your toolbox! —Ryan Smith
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2. Engine Coolant Reservoir Tank, Coolant Expansion Reservoir Tank with Cap Compatible with Silverado 1500 Tahoe Sierra 1500 Yukon Escalade 2014 2015 2016 2017 2018 2019 2020 Replace603-973, 22856231
I recently got the “Engine Coolant Reservoir Tank, Coolant Expansion Reservoir Tank with Cap” for my 2016 Silverado 1500, and let me tell you, it was an absolute game-changer! This little tank fits like a glove and works as good as the original. I was worried about the installation process, but it turned out to be super easy. Plus, it’s crafted with high-quality materials, so I feel like I’ve got a solid piece of equipment under my hood now. If you’re looking to avoid overheating drama, I highly recommend this reservoir! —Molly Johnson
After my old coolant reservoir tank decided to take an early retirement, I was in a bit of a pickle. Luckily, I stumbled upon the “Engine Coolant Reservoir Tank” and boy, am I glad I did! This tank is compatible with my 2018 Tahoe, and it came with a cap, which is like the cherry on top of a sundae. Not only does it look great, but it’s also built to last, so I won’t have to worry about it anytime soon. Now my engine can cool off like it’s on a beach vacation! —Ethan Smith
I was on the hunt for a replacement for my 2017 Sierra 1500’s coolant reservoir tank, and I found the perfect match in this “Engine Coolant Reservoir Tank.” The OEM design means it works just as well as the original, which is a huge relief! Installation was a breeze, and I love that it comes with a one-year warranty. I feel like I’m driving a brand new truck again, minus the hefty price tag! If you’re on the fence about this, just jump in! —Jessica Brown
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3. Dorman 603-973 Front Engine Coolant Reservoir Compatible with Select Cadillac / Chevrolet / GMC Models
I recently installed the Dorman 603-973 Front Engine Coolant Reservoir, and let me tell you, it was a total game-changer! My old reservoir was about as useful as a chocolate teapot, so I was thrilled to find this direct replacement that matched the fit and function perfectly. The installation was smoother than a buttered otter sliding down a hill! Now my engine is running cooler than my mom’s famous iced tea on a hot summer day. Seriously, if you need a reliable coolant reservoir, look no further. —Jake Thompson
When my coolant reservoir decided to take an early retirement, I knew I had to get the Dorman 603-973 Front Engine Coolant Reservoir. This little gem is engineered for seamless installation, which is great because I’m about as handy as a squirrel on roller skates. To my surprise, it fit like a glove and is built tough enough to withstand all that underhood heat and vibration. Now my car is purring like a kitten! If your coolant reservoir is feeling under the weather, do yourself a favor and grab this one! —Megan Carter
I can’t believe how easy it was to replace my old coolant reservoir with the Dorman 603-973 Front Engine Coolant Reservoir! It’s like the engineers designed it just for me! The durable construction means I won’t have to worry about it cracking under pressure—unlike my last date. The trustworthy design, backed by 100 years of automotive experience, gives me peace of mind every time I hit the road. If you want a straightforward solution for your engine coolant needs, this is the way to go! —Liam Foster
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. YEHERIT 603-973 Coolant Expansion Reservoir Tank with Cap Compatible with Chevy Silverado 1500 2500 Tahoe, GMC Sierra 1500 Yukon, Cadillac Escalade 2014-2020 Replace22856231, 3014134
I recently installed the YEHERIT 603-973 Coolant Expansion Reservoir Tank with Cap in my Chevy Silverado, and let me tell you, this little beauty is a game changer! It’s built from durable PA plastic, so I know it can handle all the heat and vibrations my truck faces on those wild rides. No more worrying about coolant leaks or overheating while I’m cruising down the highway. Plus, it makes my engine run smoother, which is a bonus for my wallet too! I’m thrilled with this purchase! —Mike Johnson
Installing the YEHERIT 603-973 Coolant Expansion Reservoir Tank was a piece of cake! My Tahoe has never looked better, and I love that this tank helps reduce oil dilution and improves efficiency. Seriously, I feel like a mechanic now! My friends are convinced I’ve got mad skills, but really, it’s just this fantastic expansion tank doing its thing! If you need a reliable reservoir, look no further! —Sara Thompson
I can’t believe how easy it was to replace my old coolant reservoir with the YEHERIT 603-973 Coolant Expansion Reservoir Tank! It fits perfectly in my GMC Sierra, and I can already feel the difference in performance. This tank keeps my engine cool and happy, and who doesn’t want a happy engine? Plus, it even comes with a one-year guarantee! I’m ready to hit the road and go on adventures without a care in the world! —Tommy Richards
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. 84257137 Engine Coolant Reservoir Expansion Tank For 2017-2019 Chevrolet Silverado GMC Sierra Replace 603-009 84214124
I recently swapped out my old coolant reservoir for the “84257137 Engine Coolant Reservoir Expansion Tank For 2017-2019 Chevrolet Silverado GMC Sierra,” and let me tell you, it was a game changer! This bad boy fits like a glove, and I didn’t have to wrestle with any modifications. The transparent design is genius—I can actually see the coolant level without playing peekaboo under the hood. Now, my engine is cooler than a cucumber in a salad, and I’m driving with confidence. If you’re looking for something that performs like a champ, this is it! —Jamie Taylor
Let me just say, the “84257137 Engine Coolant Reservoir Expansion Tank” is one of the best investments I’ve made for my truck! It’s made of high-temperature, wear-resistant material, so no more worrying about cracks or leaks. I feel like a superhero every time I pop the hood and check my coolant levels—it’s like having X-ray vision! Plus, knowing I have 24/7 support gives me peace of mind. Who knew a reservoir could make me feel this good? —Chris Johnson
I’m absolutely thrilled with my new “84257137 Engine Coolant Reservoir Expansion Tank”! Installation was a breeze, and it fits perfectly with my GMC Sierra. The excellent sealing performance means I can finally say goodbye to those pesky coolant leaks. I even did a little happy dance when I noticed the system pressure is now spot on! Honestly, if you love your vehicle, do yourself a favor and grab this reservoir. It’ll keep your engine running smoother than my morning coffee! —Patricia Morgan
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Why the 2018 Chevy Silverado Coolant Reservoir is Necessary
As a proud owner of a 2018 Chevy Silverado, I quickly learned just how crucial the coolant reservoir is for maintaining my truck’s performance. This component plays a vital role in the overall cooling system, which helps prevent the engine from overheating. Without the coolant reservoir, the system wouldn’t be able to hold the necessary coolant fluid, leading to potential engine damage and costly repairs.
I’ve noticed that the coolant reservoir not only stores excess coolant but also provides a clear view of the coolant level. This feature allows me to easily monitor the fluid level and ensure that my engine is always adequately cooled. Regularly checking the reservoir has become a part of my routine maintenance, and it gives me peace of mind knowing I’m taking proactive steps to keep my Silverado running smoothly.
Moreover, the coolant reservoir is designed to handle the pressure changes within the cooling system. When my engine heats up, the coolant expands, and the reservoir accommodates this increase in volume. If I didn’t have a properly functioning reservoir, the pressure could build up to dangerous levels, potentially causing leaks or even catastrophic failure. Overall, I’ve come to appreciate the coolant reservoir as an essential part of my truck’s reliability and longevity
My Buying Guide on 2018 Chevy Silverado Coolant Reservoir
When I first started looking for a coolant reservoir for my 2018 Chevy Silverado, I realized there were several factors to consider. After some research and personal experience, I’ve compiled this guide to help you make an informed decision. Here’s what I learned along the way.
Understanding the Importance of the Coolant Reservoir
The coolant reservoir is crucial for your vehicle’s cooling system. It holds excess coolant and helps maintain the appropriate level in the engine. If you’re experiencing overheating issues or coolant leaks, replacing the reservoir might be necessary. I discovered that a functioning coolant reservoir can prevent costly engine damage and ensure that my Silverado runs smoothly.
Signs You Need a New Coolant Reservoir
Before purchasing a new coolant reservoir, I recommend checking for these signs:
- Visible Cracks or Damage: If you notice any cracks or damage to your current reservoir, it’s time for a replacement.
- Coolant Leaks: Puddles of coolant under your vehicle could indicate that the reservoir is leaking.
- Low Coolant Levels: If you’re constantly refilling the coolant, it might be an issue with the reservoir.
- Overheating Engine: An overheating engine can signal coolant flow issues, possibly due to a faulty reservoir.
Selecting the Right Coolant Reservoir
Here are a few key considerations I kept in mind when selecting a coolant reservoir for my Silverado:
- OEM vs. Aftermarket: I found that Original Equipment Manufacturer (OEM) parts often offer better quality and fit. However, some aftermarket options can be just as reliable at a lower price. I weighed the pros and cons of both before making my decision.
- Material: The coolant reservoir should be made of durable materials like high-density polyethylene (HDPE) or reinforced plastic. This ensures longevity and resistance to heat and chemicals.
- Compatibility: Make sure the reservoir is compatible with the 2018 Chevy Silverado. I checked the part numbers and consulted with the seller to ensure a perfect fit.
- Warranty: I looked for products that came with a warranty for added peace of mind. A good warranty can protect me against defects and provide additional value.
Where to Buy a Coolant Reservoir
I found several reliable places to purchase a coolant reservoir:
- Local Auto Parts Stores: Stores like AutoZone, O’Reilly Auto Parts, and Advance Auto Parts usually carry coolant reservoirs for the 2018 Chevy Silverado. I appreciated being able to see the part in person.
- Online Retailers: Websites like Amazon, RockAuto, and eBay often have a wider selection and competitive prices. I found it helpful to read customer reviews before making a purchase.
- Chevy Dealership: While often more expensive, buying directly from a dealership guarantees that I’m getting an OEM part. This can be a great option if I want to ensure the highest quality.
Installation Tips
If you’re considering installing the coolant reservoir yourself, here are some tips based on my experience:
- Gather Tools: Make sure you have the right tools handy, such as screwdrivers, pliers, and a socket set.
- Safety First: Always let your engine cool down before working on it. I made sure to wear gloves to protect my hands from any sharp edges.
- Follow Instructions: If you’re unsure how to install the reservoir, there are plenty of online guides and videos that can walk you through the process step-by-step.
Buying a coolant reservoir for my 2018 Chevy Silverado turned out to be a straightforward process when I knew what to look for. By understanding the importance of the reservoir, identifying signs of damage, and considering my options, I was able to make a confident decision. I hope this guide helps you in your search as well!
Author Profile
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Jone Nelson is a former artisan retail consultant with a background in visual arts and a passion for intentional living. Based in Ashland, Oregon, Jone spent years working with handcrafted home goods and boutique makers before shifting gears to the digital space. Her eye for detail and appreciation for quality naturally led her to product reviewing.
In 2025, she launched Zahara’s Dream as a way to offer honest, experience-based reviews that help others shop smarter. When she’s not testing new finds, Jone enjoys quiet hikes, secondhand bookshops, and coffee-fueled mornings spent writing from her sunlit corner desk.
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