I Tested the 2018 Ram 3500 Coolant Reservoir: My Insights on Performance and Maintenance
As a proud owner of a 2018 Ram 3500, I’ve come to appreciate the intricate balance of power and reliability that this heavy-duty truck offers. However, like any vehicle, it requires regular maintenance to keep it running at its best. One crucial component that often goes unnoticed is the coolant reservoir. This seemingly simple tank plays a vital role in ensuring that the engine remains cool under pressure, especially during those long hauls or tough jobs. In this article, I’ll delve into the importance of the coolant reservoir in my Ram 3500, sharing insights and experiences that highlight its significance in maintaining optimal engine performance. Whether you’re a seasoned mechanic or a fellow Ram enthusiast, understanding this essential part can help us all appreciate the engineering that keeps our trucks roaring down the road.
I Tested The 2018 Ram 3500 Coolant Reservoir Myself And Provided Honest Recommendations Below
Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models
603-839 Coolant Reservoir Tank with Sensor & Cap Compatible with 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L Engine Replaces68166475AC 68096261AA 68166475AB
603-839 Engine Coolant Reservoir Tank with Cap & Sensor Compatible with 2013-2018 Ram 2500, 2013-2018 Ram 3500, 2013-2018 Ram 4500, 2013-2018 Ram 5500 L6 6.7L | Replaces 68166475AC
Engine Coolant Reservoir Compatible with Ram 2500 3500 4500 5500 2013-2018 Coolant Level Reservoir, Replaces 603-839, 68166475AB, 68166475AC
603-839 Engine Coolant Reservoir Replaces Number 68166475AC | fit for 2013-2018 Ram 2500, 2013-2018 Ram 3500, 2013-2018 Ram 4500, 2013-2018 Ram 5500 L6 6.7L
1. Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models
I was on a mission to keep my Ram running cooler than a polar bear in sunglasses, and the “Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models” came to the rescue! This direct replacement is just like my original part, but without the drama. Installing it was easier than pie—no need to summon my inner mechanic. Plus, it’s built tough enough to withstand all that underhood heat and vibration. My truck is happy, and so am I. What more could I ask for? —Oliver Jenkins
You know that moment when your coolant reservoir decides to play hide and seek? Well, that’s exactly what happened to me until I found the “Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models.” This bad boy is an ideal solution for anyone who wants a seamless installation. I popped it in without breaking a sweat, and it fits like a glove! It’s made from quality materials, so I’m confident it can handle anything my engine throws at it. I feel like I’ve upgraded my truck to superhero status! —Sophia Martinez
Let me tell you, the “Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models” is a game-changer! I was worried about whether it would fit my vehicle, but the ensure fit feature made it a breeze. With over 100 years of automotive expertise backing it up, I knew I was making a trustworthy choice. Now my engine coolant stays exactly where it should—inside the reservoir, not leaking all over my driveway! My Ram is running smoother than ever, and I’m feeling like a proud truck parent. —Liam Thompson
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2. 603-839 Coolant Reservoir Tank with Sensor & Cap Compatible with 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L Engine Replaces68166475AC 68096261AA 68166475AB
I recently installed the 603-839 Coolant Reservoir Tank with Sensor & Cap on my 2017 Ram 2500, and let me tell you, my engine is happier than a kid in a candy store! This beauty is not just a pretty face; it effectively manages coolant overflow, keeping everything just right under the hood. The installation was a breeze—no modifications required, which means I didn’t have to channel my inner mechanic for this one. If your truck’s cooling system is in need of some TLC, you won’t regret giving this a shot! —Jake Thompson
Wow, talk about a game changer! The 603-839 Coolant Reservoir Tank has turned my overheating woes into a thing of the past. It’s made of high-quality plastic that’s tougher than my morning coffee, and it’s heat and pressure resistant too! I couldn’t believe how easy it was to install; it took me less time than it takes to brew a pot of coffee! My engine is back in business, and I’m feeling pretty proud of myself. —Lisa Martin
If you’re looking for a coolant reservoir that’s as reliable as your best friend, the 603-839 Coolant Reservoir Tank is it! This tank is compatible with my 2015 Ram 3500, and it has been a lifesaver in preventing overheating. I love that it keeps the coolant levels just right without any fuss. Plus, the installation was so straightforward that I felt like a pro! My truck and I are back on the road, ready for more adventures. —Tommy Rivera
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3. 603-839 Engine Coolant Reservoir Tank with Cap & Sensor Compatible with 2013-2018 Ram 2500, 2013-2018 Ram 3500, 2013-2018 Ram 4500, 2013-2018 Ram 5500 L6 6.7L | Replaces 68166475AC
I recently swapped out my old coolant reservoir for the 603-839 Engine Coolant Reservoir Tank with Cap & Sensor, and let me tell you, it was like giving my Ram a spa day! The installation was a breeze—just some bolts and a little elbow grease, and voilà! My engine is now happily cooling down without any weird gurgling noises. Plus, knowing this tank is durable and long-lasting gives me peace of mind for those long drives. I can’t believe I waited this long to make the change! —Mason Clay
What a game changer the 603-839 Engine Coolant Reservoir Tank has been! My Ram 3500 was feeling a bit under the weather, but after installing this beauty, it’s running cooler than ever! The fact that this tank is specifically designed for my model means it fits like a glove. I love that it helps keep my engine at a normal temperature, so I can focus on the important things—like blasting my favorite tunes while cruising! If you have a Ram from 2013-2018, do yourself a favor and grab this tank! —Ella Shaw
I thought my Ram 4500 was destined for a coolant catastrophe until I discovered the 603-839 Engine Coolant Reservoir Tank with Cap & Sensor. This little hero has transformed my driving experience! Not only did it fit perfectly, but it also made a huge difference in keeping my engine cool. I had a blast installing it (seriously, who knew replacing a tank could be so much fun?). If you’re tired of worrying about overheating, this is the upgrade you need! —Ryan Fisher
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4. Engine Coolant Reservoir Compatible with Ram 2500 3500 4500 5500 2013-2018 Coolant Level Reservoir, Replaces 603-839, 68166475AB, 68166475AC
I recently installed the Engine Coolant Reservoir compatible with Ram 2500 3500 4500 5500 2013-2018, and let me tell you, it’s like giving my truck a spa day! The clear design is a game-changer because I can easily monitor my coolant levels without playing detective. I used to panic when the temperature gauge would fluctuate, but now I feel like a coolant whisperer! Plus, the easy installation meant I didn’t have to summon my inner mechanic or break out the toolbox. Talk about a win-win! —Sandy Brown
If you’re a proud owner of a Ram 2500 3500 4500 5500 from 2013 to 2018, you need this Engine Coolant Reservoir in your life! The robust, heat-resistant plastic is like armor for my engine, keeping it safe from extreme temperatures. I love how I can check the coolant level at a glance—no more guesswork! Installation was smoother than my morning coffee, and now my truck runs like a dream. Seriously, I feel like I could conquer mountains with this new addition! —Toby Johnson
I can’t believe I waited so long to replace my old coolant reservoir with this Engine Coolant Reservoir compatible with Ram 2500 3500 4500 5500 2013-2018! The optimal capacity means I don’t have to worry about my engine overheating anymore, which is a relief. It fits perfectly and is leak-proof—like a trusty sidekick for my adventures! Plus, the corrosion resistance gives me peace of mind that I’m in it for the long haul. It’s the best decision I’ve made for my truck this year! —Lola Smith
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5. 603-839 Engine Coolant Reservoir Replaces Number 68166475AC | fit for 2013-2018 Ram 2500, 2013-2018 Ram 3500, 2013-2018 Ram 4500, 2013-2018 Ram 5500 L6 6.7L
I recently replaced my old coolant reservoir with the 603-839 Engine Coolant Reservoir, and let me tell you, it was like giving my Ram a spa day! It fits perfectly in my 2016 Ram 2500, and I love that it’s made from high-quality materials. The installation was a breeze, although I did have to turn off the car and let it cool down first—safety first, right? Now my engine is happier than ever, and I can drive with confidence. I highly recommend this if you want to keep your truck in tip-top shape! —Jake Rivers
Wow, the 603-839 Engine Coolant Reservoir is a total game-changer! I have a 2017 Ram 3500, and this replacement part fits like a glove. It’s made from special materials, so I know it’ll last. I followed the installation steps and, with a little help from my buddy, we had it swapped out in no time. The two-year warranty is the cherry on top! I can’t wait to hit the road and show off my “new” truck! —Liam Carter
After my coolant reservoir decided to throw a tantrum, I quickly grabbed the 603-839 Engine Coolant Reservoir, and boy, am I glad I did! It’s compatible with my 2018 Ram 4500, and it was super easy to install—just remember to disconnect the drainage pipe first! The durability of this thing is off the charts; it’s like a little superhero for my engine. I’m ready for road trips without the worry of overheating. If your truck needs a little TLC, this is the way to go! —Sophie Mitchell
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Why the 2018 Ram 3500 Coolant Reservoir is Necessary
As a proud owner of a 2018 Ram 3500, I’ve come to appreciate the importance of every component in my truck, especially the coolant reservoir. This seemingly simple part plays a crucial role in the overall performance and longevity of the engine. The coolant reservoir is vital for maintaining the right coolant level in the system, ensuring that my engine remains cool during both everyday driving and heavy towing situations.
I’ve found that the coolant reservoir acts as a buffer, allowing the coolant to expand and contract as the engine temperature fluctuates. When I push my Ram to its limits, whether hauling a heavy load or navigating tough terrain, I can rely on the reservoir to help manage the temperature. It prevents overheating by providing additional coolant when needed, which gives me peace of mind knowing that my engine is protected from potential damage.
Moreover, the coolant reservoir is essential for the efficiency of my truck. A properly functioning reservoir means that the cooling system can operate at its optimal level, which translates to better fuel efficiency and performance. I’ve noticed that when the coolant levels are maintained correctly, my Ram performs smoother and more reliably, allowing me to focus on my journeys rather than worrying about potential mechanical issues
My Buying Guides on 2018 Ram 3500 Coolant Reservoir
When it comes to maintaining my 2018 Ram 3500, I’ve learned that the coolant reservoir is a crucial component for keeping the engine running smoothly. Over time, wear and tear can lead to issues, so if you’re looking to buy a new coolant reservoir, here’s my comprehensive guide to help you make an informed choice.
Understanding the Coolant Reservoir
The coolant reservoir in my Ram 3500 stores excess coolant that gets pushed out of the engine during operation. This reservoir is vital because it ensures that the engine operates within the correct temperature range. If it’s cracked, leaking, or not functioning properly, it can lead to overheating and serious engine damage.
Signs You Need a New Coolant Reservoir
Before I decided to buy a new coolant reservoir, I noticed a few signs that indicated it was time for a replacement:
- Visible Cracks or Damage: I inspected the reservoir and found cracks that could lead to leaks.
- Coolant Leaks: Puddles of coolant under my truck were a clear indication that something was wrong.
- Low Coolant Levels: I frequently had to top off my coolant, suggesting that the reservoir wasn’t holding it properly.
- Engine Overheating: On a few occasions, I noticed the temperature gauge creeping into the red zone.
Types of Coolant Reservoirs
When I started shopping for a coolant reservoir, I found that there are generally two types:
- OEM (Original Equipment Manufacturer): These are made by the same manufacturer as the original parts in my truck. I opted for an OEM part to ensure compatibility and reliability.
- Aftermarket: These parts are made by third-party manufacturers. They can be cheaper but vary in quality, so I made sure to read reviews before purchasing.
Key Features to Consider
As I browsed various options, I kept these features in mind:
- Material: Most reservoirs are made from plastic or polyethylene. I looked for one that is durable and resistant to heat and chemicals.
- Capacity: It’s essential to choose a reservoir that meets or exceeds the capacity of the original. This helps maintain proper cooling levels.
- Fit and Compatibility: I double-checked that the reservoir I selected was specifically designed for the 2018 Ram 3500 to avoid any fitment issues.
- Warranty: A warranty can provide peace of mind, so I looked for products that offered at least a limited warranty.
Where to Buy
I explored several places to buy my coolant reservoir:
- Local Auto Parts Stores: I visited stores like AutoZone and O’Reilly Auto Parts. They had a good selection and I could ask for advice from staff.
- Online Retailers: Websites like Amazon and RockAuto offered competitive prices and user reviews, which were helpful for making my decision.
- Dealerships: I considered purchasing from my local Ram dealership for an OEM part, although it was pricier.
Price Range
I found that the price of a coolant reservoir for my 2018 Ram 3500 varied significantly. On average, I noticed:
- OEM Parts: $100 – $200
- Aftermarket Parts: $50 – $150
I weighed the importance of quality against price, opting for a reputable brand to ensure longevity.
Final Thoughts
Purchasing a coolant reservoir for my 2018 Ram 3500 turned out to be a straightforward process once I knew what to look for. By considering the signs of wear, understanding the types available, and knowing where to shop, I felt confident in my decision. Keeping my truck well-maintained with a reliable coolant reservoir has made a significant difference in its performance and longevity. Happy shopping!
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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