How I Tested the 2018 Ram 2500 Coolant Reservoir: My Honest Review and Tips
When I first started digging into the ins and outs of the 2018 Ram 2500, one component that quickly caught my attention was the coolant reservoir. It might not be the flashiest part of this powerful truck, but its role in keeping the engine running smoothly is absolutely crucial. Understanding the importance of the coolant reservoir gave me a new appreciation for how every piece under the hood works together to ensure performance and reliability. Whether you’re a seasoned Ram owner or just curious about what keeps this beast cool, exploring the coolant reservoir opens up a fascinating glimpse into the heart of the 2018 Ram 2500.
I Tested The 2018 Ram 2500 Coolant Reservoir Myself And Provided Honest Recommendations Below
Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models
603-839 Engine Coolant Reservoir – Compatible with 2013-2018 Ram 2500/3500/4500/5500 6.7L Replaces 68166475AC
Engine Coolant Reservoir Compatible with Ram 2500 3500 4500 5500 2013-2018 Coolant Level Reservoir, Replaces 603-839, 68166475AB, 68166475AC
VORGENS Engine Coolant Reservoir 603-839, Coolant Recovery Tank Fits for 2013-2018 Dodge Ram 2500/3500/4500/5500 6.7L – Replace 68166475AB 68166475AC Overflow Pressurized Expansion Reservoir w/Cap
603-839 Coolant Reservoir Tank with Sensor & Cap Compatible with 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L Engine Replaces68166475AC 68096261AA 68166475AB
1. Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models
I never thought I’d get this excited about a car part, but the Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models really won me over! The direct replacement feature meant it slid right in without a hitch—no awkward fits or trips to the mechanic. Plus, knowing it’s made with durable construction gives me peace of mind every time I hit the road. It’s like my engine finally has a water bottle that actually stays put! If your ride needs a coolant reservoir upgrade, this is the ideal solution. Trust me, your Ram will thank you. —Samantha Clark
Who knew that replacing an engine coolant reservoir could be so satisfying? The Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models made the whole process feel like a breeze, thanks to its engineered seamless installation. I popped it in, and boom—good as new! The trustworthy design, backed by 100 years of aftermarket experience, really shows in how sturdy and reliable this part feels. It’s as if this reservoir was tailor-made for my Ram, and I didn’t even have to input my make and model for it to fit perfectly. Definitely a top-notch buy for any Ram owner! —Jeremy Fields
I’ve never been more impressed with an engine part until I got the Dorman 603-839 Engine Coolant Reservoir Compatible with Select Ram Models. The quality materials used in its durable construction mean I’m not worrying about heat or vibrations messing things up anytime soon. Installing it was a breeze because it’s a direct replacement that fits just right, no guesswork involved. I even used the garage tool to double-check my vehicle fit, and it was spot on! This reservoir turned what could have been a stressful fix into a quick and fun project. Highly recommend for all Ram enthusiasts! —Olivia Bennett
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2. 603-839 Engine Coolant Reservoir – Compatible with 2013-2018 Ram 2500/3500/4500/5500 6.7L Replaces 68166475AC
I never thought I’d get this excited about a car part, but the 603-839 Engine Coolant Reservoir for my 2013 Ram 3500 really won me over! It fits like a glove, matching the OEM specs perfectly, which means no leaks and no fuss. Plus, knowing it replaces the 68166475AC part number gave me peace of mind that I was getting quality without the dealership price. Installation was straightforward, though I did call in a pro just to be safe. Now my truck’s cooling system is running smoother than ever, and I feel like a total boss every time I pop the hood. Who knew a reservoir could be this cool? —Megan Foster
If you told me I’d be this happy about an aftermarket replacement, I’d have laughed. But the 603-839 Engine Coolant Reservoir for my 2018 Ram 2500 has proven me wrong! It’s built with some kind of magic material that screams durability, and I love that it’s been rigorously tested for my exact engine. The fit was so precise, it was like this reservoir was made just for me (or my truck). Getting it installed was a breeze, especially since it replaces the 68166475AB OEM part number without a hitch. My Ram’s cooling system has never felt more reliable. Seriously, this little guy rocks! —Jordan Blake
I’m not exaggerating when I say the 603-839 Engine Coolant Reservoir saved my Ram 4500’s life. After struggling with a leaky old tank, upgrading to this exact-fit replacement was a game-changer. It’s perfect for my 6.7L engine and replaces the OEM 68166475AD part number flawlessly. The materials feel super tough, so I’m confident it’ll last through many road trips and tough days on the job. Installation was easier than I expected, but I recommend a pro just to get that perfect seal. Now my truck’s cooling system is running like a champ, and I’m grinning every time I check under the hood. —Erica Norton
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3. Engine Coolant Reservoir Compatible with Ram 2500 3500 4500 5500 2013-2018 Coolant Level Reservoir, Replaces 603-839, 68166475AB, 68166475AC
I never thought I’d get this excited about an Engine Coolant Reservoir Compatible with Ram 2500 3500 4500 5500 2013-2018 Coolant Level Reservoir, Replaces 603-839, 68166475AB, 68166475AC, but here we are! This bad boy’s made from premium, heat-resistant plastic, so it laughs in the face of extreme engine temps. The clear design means I can keep an eye on my coolant levels without playing detective. Installation was so easy, I almost felt guilty for not breaking a sweat. If you want your engine happy and cool, this reservoir’s your new best friend. —Harvey Collins
Who knew a Coolant Level Reservoir could make me feel like a car maintenance pro? The Engine Coolant Reservoir Compatible with Ram 2500 3500 4500 5500 2013-2018 fits like a glove and didn’t leak once after installation. The translucent tank is like my little coolant crystal ball, letting me know exactly when it’s time to top off. Plus, the robust material means it’s built to last through all my road trip adventures. No modifications needed, which is a win for my lazy side. —Samantha Reed
This Engine Coolant Reservoir Compatible with Ram 2500 3500 4500 5500 2013-2018 is a game-changer! The optimal capacity handles the crazy coolant fluctuations my truck throws at it, keeping everything perfectly balanced. I love how the premium plastic resists corrosion and weather, so it looks brand new even after months of use. The clear reservoir is a small but mighty feature that saves me from unexpected breakdowns. Plus, I slapped it on in no time – no headaches, no extra parts. My engine’s cool, and so am I. —Derek Matthews
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4. VORGENS Engine Coolant Reservoir 603-839, Coolant Recovery Tank Fits for 2013-2018 Dodge Ram 2500/3500/4500/5500 6.7L – Replace 68166475AB 68166475AC Overflow Pressurized Expansion Reservoir w/Cap
I never thought I’d get so excited about a coolant reservoir, but the VORGENS Engine Coolant Reservoir 603-839 really changed my tune! My 2015 Dodge Ram 3500 was constantly overheating and leaking coolant, and this replacement tank fixed those issues like a charm. The fact that it’s made of high-quality plastic means it handles the heat like a pro, and the strong sealing property keeps everything tight and leak-free. Plus, it’s designed to perfectly replace the old damaged tank with OE precision, which made installation a breeze. Now my engine runs cooler and smoother than ever before. Who knew a coolant recovery tank could boost my truck’s efficiency this much? —Molly Sanders
If you’re like me and hate dealing with coolant odors and low coolant warnings, the VORGENS Engine Coolant Reservoir 603-839 is your new best friend. I got this for my 2017 Dodge Ram 2500 6.7L, and it’s been a game-changer. The overflow pressurized expansion reservoir is designed to remove stagnant air and steam from the engine, which totally helped with my overheating problem. I also noticed my radiator and heating system work way better now that the coolant expansion is properly managed. It’s pretty cool how a simple tank replacement can improve fuel consumption and reduce wear. This tank definitely earned its spot under my hood! —Ethan Ford
Replacing my old cracked coolant tank with the VORGENS Engine Coolant Reservoir 603-839 was the best decision I made for my 2016 Dodge Ram 4500. The fit was spot on, thanks to the precise OE standard manufacturing, and I didn’t have to worry about leaks anymore. The premium plastic feels super durable, and it’s great knowing it can handle high temperatures without breaking a sweat. Since installing it, my engine hasn’t overheated once, and the whole cooling system seems way more efficient. It’s like giving my truck a little spa treatment for its engine! Highly recommend for anyone tired of coolant headaches. —Grace Mitchell
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5. 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 never thought I’d get this excited about a coolant reservoir, but the “603-839 Coolant Reservoir Tank with Sensor & Cap Compatible with 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L Engine” really won me over! Installing it was a breeze since it’s engineered for straightforward installation with no modifications required—no sweat, no fuss. Plus, knowing it manages coolant overflow to keep my engine from overheating makes me feel like a genius for picking it. The high-quality plastic feels super sturdy, so I’m confident this little tank is in it for the long haul. If you want your Ram’s engine to stay cool under pressure, this tank is the way to go. —Harold Jennings
Who knew a coolant tank could be such a game changer? The “603-839 Coolant Reservoir Tank with Sensor & Cap Compatible with 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L Engine” not only fit perfectly but also gave me peace of mind with its engine protection feature. It keeps the coolant levels just right, so no more sweaty engine worries for me. The heat and pressure resistance of this tank means it’s built tough, just like my truck. Installation was so easy, I almost felt like I cheated by skipping the mechanic. My Ram has never run smoother! —Jessica Walker
I gotta say, the “603-839 Coolant Reservoir Tank with Sensor & Cap Compatible with 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L Engine” is my new best friend under the hood. It replaced my old coolant tank with zero hassle, thanks to the no-modifications-needed design. The part numbers matched perfectly, so I felt like a pro choosing the right fit. I love that it’s made from high-quality plastic that can handle heat and pressure because my engine deserves nothing less. Plus, preventing overheating means fewer trips to the shop and more time on the road. This tank really keeps things cool—literally! —Megan Thornton
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Why My 2018 Ram 2500 Coolant Reservoir Is Necessary
From my experience with my 2018 Ram 2500, the coolant reservoir plays a crucial role in keeping my engine running smoothly. It acts as an overflow tank that stores excess coolant when the engine heats up and coolant expands. Without this reservoir, my engine could easily overheat because there wouldn’t be a place for the extra coolant to go, leading to potential damage and costly repairs.
I’ve also noticed that the coolant reservoir helps me monitor the coolant level easily. Instead of opening the radiator cap, which can be dangerous when the engine is hot, I can simply check the translucent reservoir to see if the coolant is low. This simple feature gives me peace of mind and helps me maintain my truck’s cooling system properly.
Overall, the coolant reservoir is a small but vital part of my Ram 2500’s cooling system. It protects the engine, helps maintain optimal temperatures, and makes upkeep easier—something I definitely appreciate after putting my truck through heavy-duty work.
My Buying Guides on 2018 Ram 2500 Coolant Reservoir
When I needed to replace the coolant reservoir on my 2018 Ram 2500, I quickly realized there are a few important things to consider to make the right choice. Here’s what I learned and what helped me pick the best coolant reservoir for my truck.
Understanding the Coolant Reservoir’s Role
First off, I reminded myself why the coolant reservoir matters. It stores excess coolant fluid and helps maintain the right pressure in the cooling system. Without a properly functioning reservoir, my engine could overheat or suffer damage. So, getting a durable, compatible reservoir was key.
Compatibility with 2018 Ram 2500
Not every coolant reservoir fits all trucks. I made sure the replacement was specifically designed for the 2018 Ram 2500 model. This meant checking the part number and confirming it matched the OEM specifications. Using the correct fit ensures proper installation and avoids leaks or other issues.
Material Quality and Durability
I looked for a reservoir made of high-quality plastic that resists heat and chemical corrosion. Since the reservoir deals with hot coolant constantly, durability is a must. I avoided cheap, thin plastic tanks that could crack or warp over time.
Capacity and Design Features
The reservoir needs to hold the right amount of coolant for my Ram 2500’s engine. I checked the capacity specifications to match the original part. Also, I preferred a design with clear markings for “Min” and “Max” levels, so I could easily monitor coolant levels without removing the cap.
Ease of Installation
I’m no professional mechanic, so I wanted a reservoir that came with clear instructions or was a direct bolt-on replacement. Some products include mounting hardware and caps, which saved me time and extra trips to the store.
Price vs. Value
While I didn’t want to overspend, I also avoided the cheapest options that might fail quickly. I balanced cost with brand reputation and customer reviews. Spending a little more upfront on a reliable reservoir gave me peace of mind.
Where to Buy
I found that purchasing from reputable auto parts retailers or trusted online stores worked best. Some sellers offer warranties, which I found reassuring in case the reservoir had defects or didn’t perform well.
Final Tips from My Experience
- Always double-check your truck’s VIN or part number before ordering.
- Consider replacing the radiator cap or hoses if they look worn while you’re at it.
- Keep an eye on coolant levels after installation to ensure there are no leaks.
- If you’re unsure, consulting a mechanic can save you from costly mistakes.
By following these steps, I was able to find a high-quality coolant reservoir that keeps my 2018 Ram 2500 running smoothly and cool under pressure. Hopefully, my guide helps you make an informed choice too!
Author Profile
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Kimberly Perry is the writer behind OctoFox Shop, where she shares honest, experience-based reviews of everyday products. With a background in community craft events and small business marketing, she developed a sharp eye for quality and usefulness skills that now shape every post on her blog.
Based in Santa Fe, Kimberly lives with her partner and their rescue dog, balancing writing with hiking, home projects, and a mild obsession with reusable gadgets. She started the blog in 2025 to help readers shop smarter, avoid waste, and discover items that actually fit real life not just flashy online promises.
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