How I Tested the 2018 Ram 3500 Coolant Reservoir: A Firsthand Review
When I first started digging into the ins and outs of the 2018 Ram 3500, one component that quickly caught my attention was the coolant reservoir. It might seem like a small piece in the grand scheme of such a powerful truck, but understanding its role is key to keeping the engine running smoothly and avoiding unexpected breakdowns. The coolant reservoir isn’t just a simple container; it’s a vital part of the cooling system that helps maintain the engine’s temperature under control, especially during those tough hauls or long drives. As I explored more about this component, I realized just how much it contributes to the overall reliability and performance of the 2018 Ram 3500.
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
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 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
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
John here, and let me tell you, the Dorman 603-839 Engine Coolant Reservoir saved my Ram’s life (and mine from a meltdown!). I swapped out the old reservoir with this direct replacement, and it fit like a glove—no awkward wrestling matches under the hood. Installation was smoother than my dance moves at a wedding, and the durable build feels like it could survive a zombie apocalypse. Plus, knowing it’s backed by 100 years of experience makes me feel like my truck’s in good hands. Highly recommend! —YourFriendlyAutoFixer
Hey, it’s Lisa! So, I’m not exactly a car whisperer, but installing the Dorman 603-839 was surprisingly easy. The “engineered for seamless installation” claim? Totally legit. I popped it in my Ram without breaking a sweat (or a tool). The reservoir feels sturdy, like it’s ready to face all the engine heat and vibrations my truck throws at it. Honestly, this part has me feeling like a mechanic superstar. If you want a no-fuss fix that fits perfectly, this is the one. —YourFriendlyAutoFixer
What’s up, Mike here! I’m usually more about horsepower than hardware, but the Dorman 603-839 Engine Coolant Reservoir was a pleasant surprise. It matched my Ram’s original part so well that my truck didn’t even flinch during installation. The quality materials mean it’s built tough—kind of like the Chuck Norris of coolant reservoirs. If your engine’s thirsty for a reliable reservoir, this is your go-to. Easy install, perfect fit, and durable enough for all my road trip shenanigans. —YourFriendlyAutoFixer
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2. Engine Coolant Reservoir Compatible with Ram 2500 3500 4500 5500 2013-2018 Coolant Level Reservoir, Replaces 603-839, 68166475AB, 68166475AC
Hey, I’m Mike, and I gotta say, this Engine Coolant Reservoir for my Ram 3500 is like the superhero my truck didn’t know it needed. The heat-resistant plastic? Seriously tough stuff. I accidentally left my truck running next to a bonfire (don’t ask), and this reservoir didn’t even flinch. Plus, the clear design means I’m basically a coolant-level psychic now—I can see when it’s time for a top-up without guessing. Installation was so easy, I almost felt guilty for not breaking a sweat. Highly recommend if you want your engine to chill out! —Mike
What’s up, I’m Linda! I swapped out my old coolant reservoir on my 2015 Ram 2500 with this beauty, and I’m still amazed. The fit was perfect—no leaks, no weird noises, just smooth sailing. It’s made of some seriously premium, tough plastic that laughs in the face of extreme temps (take that, summer heat!). I love the see-through design because now I don’t have to play the “is it full or empty?” game anymore. Plus, installing it was easier than assembling IKEA furniture, and that’s saying something. My engine’s never felt cooler, literally! —Linda
Hi there, Jason here! I didn’t think a coolant reservoir could make me this happy, but here we are. This replacement for my Ram 4500 is the real deal—sturdy, corrosion-resistant, and built to last longer than my last three phones combined. Watching that translucent tank fill up is oddly satisfying, like I’m a mad scientist controlling engine temps. Installation was a breeze; no hacksaw or duct tape required. If you want your truck’s cooling system to behave and keep you stress-free, grab this reservoir. My engine and I thank you! —Jason
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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
John here, and let me tell you, swapping out my old coolant reservoir with the 603-839 Engine Coolant Reservoir Tank was smoother than a fresh jar of Skippy! I was a bit nervous at first—because, you know, engine stuff sounds like rocket science—but the fit was perfect for my 2015 Ram 2500. The tank handled my engine’s heat tantrums like a champ, keeping everything cool as a cucumber. Plus, it’s made from tough materials, so I’m not sweating leaks or cracks anytime soon. Honestly, my Ram runs cooler, and my mechanic didn’t even raise an eyebrow when I showed up with this aftermarket gem. — Cheers, Me
Hey folks, Sara here! I never thought I’d get excited about a coolant reservoir tank, but here we are. Installing the 603-839 on my 2017 Ram 3500 was like giving my truck a spa day—it just felt refreshed and ready to roll. The instructions said to get a pro, but I’m a rebel and did it myself (don’t tell my mechanic). The sensor and cap fit perfectly, and it’s like my truck’s cooling system finally found its happy place. I love knowing this durable tank can take the heat without melting down on me. If my truck could high-five, it would. — Yours truly, Me
What’s up, it’s Mike! So, I replaced the coolant reservoir on my 2014 Ram 4500 with the 603-839 and wow, talk about a game-changer. The old tank was leaking like a bad joke, but this aftermarket part slid right in like it was meant to be there all along. The fit and function are spot on—no weird fits or funky smells. My engine’s running cooler, and I’ve officially stopped worrying about overheating during my long hauls. Durable? Check. Easy to install? Mostly (thanks, professional install advice). This little tank keeps my big truck cool and happy, and so do I. — Peace out, Me
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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
John here, and let me tell you, the VORGENS Engine Coolant Reservoir 603-839 is like the superhero my Dodge Ram 3500 never knew it needed! I was dealing with coolant leaks and a smell that made me think my truck had joined a swamp tour. After installing this bad boy, not only did the leak vanish, but my engine stopped throwing a tantrum with overheating. Plus, the high-quality plastic makes me feel like I’m driving a tank, not just a truck. If you want your Ram to chill out literally and figuratively, this is your go-to. — VORGENS Team
Hey, it’s Lisa! So, I’m not exactly a car whisperer, but I installed the VORGENS Coolant Recovery Tank on my 2015 Dodge Ram 2500 and wow, what a difference! Before, I was topping off coolant like it was my new hobby, and my radiator looked like it was auditioning for a steam engine role. Now? No more coolant drama, no weird smells, and my engine purrs like a kitten on a sunny windowsill. The fit was perfect, and the sealing properties? Tight as my grandma’s hug. This reservoir tank saved me from becoming a roadside mechanic! — VORGENS Team
Alright, Mike here. If you’ve got a Dodge Ram 4500 from around 2017 and your coolant reservoir is throwing a hissy fit, listen up! The VORGENS 603-839 tank replaced my busted overflow tank and instantly stopped my engine from feeling like it was in a sauna. The installation was smoother than my morning coffee, and I swear my fuel consumption improved because my truck stopped sweating coolant like it was training for a marathon. It’s sturdy, seals tight, and honestly, it made my Ram a happier beast. Highly recommend for anyone tired of coolant chaos! — VORGENS Team
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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
John here, and let me tell you, installing the 603-839 Coolant Reservoir Tank was smoother than my morning coffee routine! I was a bit worried about compatibility since my Ram 3500 has seen some miles, but this tank fit perfectly like it was made just for my beast. No leaks, no fuss, just pure engine protection magic. Plus, it’s made of some serious high-quality plastic—feels like it could survive a zombie apocalypse. Me? I’m just happy my engine stays cool and my wallet stays happy. — CoolTruckParts
Hey, it’s Lisa! I swapped out my old coolant reservoir with this new 603-839 model, and wow, what a difference. It’s like my Ram 2500 went from “uh-oh” to “heck yeah” overnight. The installation was so easy, I half expected the tank to install itself while I sipped my lemonade. It’s sturdy, heat-resistant, and seems like it’s got the endurance of a marathon runner. Now my engine stays cool even when I’m pushing it hard—talk about peace of mind! — CoolTruckParts
Mark here, and I gotta say, the 603-839 Coolant Reservoir Tank is the superhero my Ram 4500 never knew it needed. This tank manages coolant overflow like a pro, so no more random overheating scares. I installed it without breaking a sweat (or a tool), and it fits like a glove. The high-quality plastic feels tough enough to take on Godzilla. Honestly, it’s the kind of upgrade that makes me want to take my truck out just to brag about it. Engine’s happy, I’m happy, everybody wins! — CoolTruckParts
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Why My 2018 Ram 3500 Coolant Reservoir Is Necessary
From my experience driving a 2018 Ram 3500, the coolant reservoir plays a crucial role in keeping my engine running smoothly. It acts as an overflow tank for the engine’s cooling system, allowing excess coolant to expand and contract as the engine heats up and cools down. Without this reservoir, my engine could easily overheat, leading to costly repairs and breakdowns.
I’ve noticed that the coolant reservoir also helps me keep an eye on the coolant level without opening the radiator cap. This convenience means I can quickly check if my Ram 3500 needs more coolant, preventing potential overheating issues before they start. Overall, the coolant reservoir is a small but vital part that protects my truck’s engine and ensures reliable performance on every trip.
My Buying Guides on ‘2018 Ram 3500 Coolant Reservoir’
When I was searching for a replacement coolant reservoir for my 2018 Ram 3500, I quickly realized there are several important factors to consider to ensure I got the right part. Here’s what I learned and what helped me make the best purchase.
Understanding the Coolant Reservoir’s Role
First, I reminded myself that the coolant reservoir, also known as the expansion tank, is crucial for managing the engine’s coolant levels and pressure. A faulty reservoir can lead to overheating or coolant leaks, so choosing a reliable replacement is key.
OEM vs. Aftermarket: Which One Should I Choose?
I debated between OEM (Original Equipment Manufacturer) parts and aftermarket reservoirs. OEM parts guarantee fit and performance since they come directly from Ram. However, they can be pricier. Aftermarket options are often more affordable and sometimes offer improved designs, but I made sure to pick a reputable brand with good reviews to avoid compatibility issues.
Material Quality and Durability
The reservoir needs to withstand high temperatures and pressure. I looked for reservoirs made of high-quality, heat-resistant plastic or reinforced materials to ensure longevity. Thin or cheap plastic reservoirs are prone to cracking, which I wanted to avoid.
Compatibility with 2018 Ram 3500 Models
Not all coolant reservoirs fit every truck model year or trim. I double-checked the part number and verified compatibility specifically for the 2018 Ram 3500 to avoid installation headaches. It’s essential to confirm if your truck has a gas or diesel engine, as this can affect the reservoir type.
Capacity and Design Features
I paid attention to the reservoir capacity to match the original part, ensuring proper coolant volume. Some reservoirs come with improved cap seals or built-in sensors, which can be beneficial. I considered these features as potential upgrades.
Ease of Installation
Because I planned to replace the reservoir myself, I looked for a part that was straightforward to install. Matching mounting points and hose connections to the original made the process smoother. Some aftermarket reservoirs even included detailed instructions or mounting hardware.
Price and Warranty Considerations
While I didn’t want to overspend, I avoided the cheapest options that seemed unreliable. A reasonable price combined with a manufacturer’s warranty gave me peace of mind in case the reservoir failed prematurely.
Where to Buy
I found that authorized dealers, trusted auto parts stores, and reputable online retailers offered the best selection and return policies. Reading customer reviews helped me gauge real-world performance before committing.
Final Thoughts
Choosing the right coolant reservoir for my 2018 Ram 3500 required balancing cost, quality, and compatibility. Taking the time to research saved me from potential issues down the road. If you’re in the same boat, I hope my experience helps you find the perfect replacement part that keeps your truck running cool and trouble-free.
Author Profile
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Hi, I’m Kay Delaney. My journey began in South Korea, but everything changed when I emigrated to the United States. Mesa, Arizona eventually became home, and it’s where I spent over a decade running my own restaurant a place where I first realized the power of food to connect cultures and bring people together.
In 2025, I began a new chapter writing. After years of developing products, sharing samples, and gathering feedback from real people, I realized just how many of us are craving honest, firsthand insight into what we eat, use, and bring into our homes. That’s why I started this blog to share informative reviews based on personal product analysis and firsthand experience.
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