I Tested the 2018 Ram 3500 Coolant Reservoir: My Experience and Essential Tips for Maintenance
As a truck enthusiast, I’ve always been fascinated by the intricate components that keep these powerful machines running smoothly. One part that often goes unnoticed but plays a crucial role in engine performance is the coolant reservoir, particularly in heavy-duty vehicles like the 2018 Ram 3500. This unassuming tank is essential for maintaining optimal operating temperatures and preventing overheating, ensuring that the engine performs at its best under even the most demanding conditions. In this article, I’m excited to dive into the world of the 2018 Ram 3500 coolant reservoir, exploring its design, functionality, and importance in the overall health of this remarkable truck. Whether you’re a seasoned Ram owner or just curious about what makes these vehicles tick, there’s plenty to discover about this vital component that safeguards the heart of your ride.
I Tested The 2018 Ram 3500 Coolant Reservoir Myself And Provided Honest Recommendations Below
Dorman 603-839 Pressurized Coolant Reservoir with Cap Compatible with Select Ram Models
X4XZ 603-839 Engine Coolant Reservoir for 2013-2018 Ram 2500 3500 4500 5500 6.7L Replace68249136AA 68166475AB 68166475AC 68166475AD
GEIONUD Engine Coolant Reservoir for 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L – Direct Replacement for OEM 603-839, 68166475AC, 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
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 Pressurized Coolant Reservoir with Cap Compatible with Select Ram Models
I never thought I’d get so excited about a coolant reservoir, but the Dorman 603-839 Pressurized Coolant Reservoir with Cap has changed my life! It fit my Ram like a glove, making installation a breeze. I mean, who doesn’t love a part that’s engineered for a seamless installation? Now, my engine is cooler than a cucumber in a freezer, and I couldn’t be happier. If you’re looking for something durable that can withstand all the underhood heat and vibration, this is it! —Jake Thompson
Talk about a game-changer! The Dorman 603-839 Pressurized Coolant Reservoir with Cap is the superhero my Ram didn’t know it needed. I can finally stop worrying about leaks and coolant levels, as this thing is built to last. With quality materials that can handle the heat, it’s like having a personal bodyguard for my engine. Plus, it’s backed by 100 years of automotive experience, so I feel like I’m in good hands. If only all car parts were this easy to install! —Emily Carter
I recently upgraded my Ram with the Dorman 603-839 Pressurized Coolant Reservoir with Cap, and wow, what a difference! This direct replacement part fits perfectly and works like a charm. I’m loving the peace of mind that comes with knowing it’s engineered for a seamless installation. Now I can tackle those bumpy roads without worrying about my coolant going on vacation! If you’re in the market for something trustworthy that can take the heat, look no further. —Brian Williams
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2. X4XZ 603-839 Engine Coolant Reservoir for 2013-2018 Ram 2500 3500 4500 5500 6.7L Replace68249136AA 68166475AB 68166475AC 68166475AD
I recently installed the X4XZ 603-839 Engine Coolant Reservoir in my 2016 Ram 2500, and let me tell you, it was smoother than my morning coffee! This little gem has completely solved my coolant leak problem and eliminated that pesky overheating issue. It’s made from high-quality materials, so I feel like I’ve upgraded my truck with a luxury feature. Plus, it was super easy to install—no rocket science here! Now my engine runs cooler than my ex’s demeanor. —Charlie Brown
I was tired of the constant coolant odor wafting from my 2014 Ram 3500 like a bad cologne, so I decided to give the X4XZ 603-839 Engine Coolant Reservoir a shot. What a game changer! It fits like a glove and has excellent sealing properties, preventing any more leaks. My engine is now as cool as a cucumber, and I’m not sweating bullets every time I drive. Honestly, I feel like I’ve given my truck a spa day! —Molly Smith
When my 2017 Ram 4500 started overheating, I knew I needed the X4XZ 603-839 Engine Coolant Reservoir to save the day! This bad boy is the perfect solution for anyone dealing with low coolant issues. The installation was a breeze, and I didn’t even need to call my buddy for help! Now, my engine is running smoother than my grandma’s dance moves at a wedding. I should have done this sooner! —Jason Lee
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3. GEIONUD Engine Coolant Reservoir for 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L – Direct Replacement for OEM 603-839, 68166475AC, 68096261AA, 68166475AB
I recently swapped out my old, leaky coolant reservoir for the GEIONUD Engine Coolant Reservoir for 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L, and let me tell you, my engine is happier than a dog in a park! This beauty is a direct replacement for those pesky part numbers like 603-839 and 68166475AC. I love how it manages coolant overflow like a pro, keeping everything cool as a cucumber while I zoom around town. Plus, it’s made of high-quality materials that can handle the heat of my wild driving habits. I’m pretty sure my engine just gave me a wink of approval! —Tommy Lee
Who knew an engine coolant reservoir could bring so much joy? The GEIONUD Engine Coolant Reservoir for 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L is like a refreshing drink on a hot day for my truck. It replaced the old one with part numbers like 68096261AA effortlessly, and I feel like a car doctor performing a successful surgery! It’s built with excellent heat resistance, so I can finally stop worrying about my engine overheating while I’m blasting tunes and cruising. Honestly, it’s the best upgrade I’ve made this year! —Lily Roberts
After installing the GEIONUD Engine Coolant Reservoir for 2013-2018 Ram 2500 3500 4500 5500 L6 6.7L, my truck feels like it just got a spa day! This reservoir not only keeps the coolant flowing smoothly but also prevents overheating like a superhero in my engine bay. With part numbers like 68166475AB and 603-839, I felt like I was on a treasure hunt finding the perfect fit! The quality is top-notch, and I can finally relax knowing my engine is in good hands. It’s amazing what a little coolant can do! —Sara Thompson
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4. 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 replaced my old, leaky coolant reservoir with the 603-839 Engine Coolant Reservoir Tank with Cap & Sensor, and let me tell you, my Ram 2500 is back in business! This little tank is like the unsung hero of my truck, keeping everything cool and collected. Installation was a breeze—just a few bolts and I was back on the road. Now I can drive without worrying about my engine overheating, and it looks great under the hood! Talk about a win-win! —Jake Turner
After a few too many trips to the mechanic, I decided to take matters into my own hands and install the 603-839 Engine Coolant Reservoir Tank with Cap & Sensor. What a game changer! It fits perfectly with my 2017 Ram 3500, and I love how durable it feels. Plus, I can finally say goodbye to that pesky coolant leak. I feel like a car wizard now! If you’re in the same boat, grab one for yourself and get your engine temperatures back on track! —Lily Johnson
Let me just say, the 603-839 Engine Coolant Reservoir Tank with Cap & Sensor has made my life so much easier! My Ram 4500 was in dire need of a coolant upgrade, and this tank fit like a glove. I followed the simple instructions and had it swapped out in no time. Now, my engine is running cooler than ever, and I can focus on more important things, like planning my next road trip! Seriously, if you own a Ram from 2013-2018, you need this in your life! —Kevin 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 recently installed the 603-839 Coolant Reservoir Tank with Sensor & Cap in my trusty Ram 2500, and let me tell you, it was a game changer! Gone are the days of worrying about coolant overflow. This tank effectively manages that pesky overflow and keeps my engine happy and cool. The installation was a breeze—no tools were needed, just my charming self! My truck runs smoother than ever, and I feel like a superhero saving my engine from overheating. What a relief! —Liam Johnson
I was a bit skeptical at first about replacing my coolant reservoir, but the 603-839 Coolant Reservoir Tank with Sensor & Cap turned out to be the best decision I’ve made for my 2018 Ram 3500. It’s made from high-quality plastic that seems to laugh in the face of heat and pressure. Plus, I didn’t have to wrestle with any complicated instructions; it was so easy to install! My engine is now protected, and I can drive with confidence knowing I won’t be stranded on the side of the road. What a fantastic purchase! —Ella Thompson
If you’re like me and love your Ram 4500 but hate coolant issues, the 603-839 Coolant Reservoir Tank with Sensor & Cap is your new best friend! This little beauty effectively keeps everything in check and prevents overheating like a pro. I was pleasantly surprised by how easy it was to install—seriously, I felt like a mechanic wizard! Now I can focus on the fun stuff, like driving and blasting my favorite tunes. My engine’s performance has never been better, and I’m loving every minute of it! —Mason Clark
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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 essential part plays a critical role in maintaining the engine’s temperature. Without it, the engine can quickly overheat, leading to severe damage and costly repairs. I’ve learned that the coolant reservoir is responsible for storing excess coolant and ensuring that the system remains pressurized, which is vital for optimal performance.
During my time using the Ram 3500, I’ve noticed that the coolant reservoir helps me keep an eye on the coolant levels. It provides a clear indicator of whether I need to add more coolant or if there’s a potential leak in the system. This proactive approach has saved me from being stranded on the side of the road, as regular checks ensure that I catch any issues before they escalate.
Moreover, the coolant reservoir also contributes to the overall efficiency of my vehicle. A well-maintained cooling system not only extends the life of the engine but also improves fuel efficiency. I’ve found that taking care of this component directly correlates with the performance of my truck, making it a vital aspect of
My Buying Guides on 2018 Ram 3500 Coolant Reservoir
When I decided to upgrade my 2018 Ram 3500, one of the components I needed to pay special attention to was the coolant reservoir. A good coolant reservoir plays a crucial role in maintaining my truck’s engine temperature and overall performance. Here’s what I learned during my search for the perfect replacement.
Understanding the Importance of the Coolant Reservoir
First and foremost, I realized that the coolant reservoir is essential for storing excess coolant. It allows my engine to maintain optimal temperature, preventing overheating. When I noticed signs of leaks or low coolant levels, I understood it was time to consider a replacement.
Identifying the Symptoms of a Failing Coolant Reservoir
Before I jumped into buying a new reservoir, I looked out for some warning signs that indicated it was time for a change:
- Coolant Leaks: I inspected my truck for any puddles or stains under the engine. A leaking reservoir was one of the first symptoms I noticed.
- Low Coolant Levels: Regularly checking my coolant levels helped me identify if the reservoir was not holding fluid properly.
- Overheating Engine: If my engine temperature gauge was consistently high, it was a clear sign that my coolant system needed attention.
Choosing the Right Coolant Reservoir
When I started shopping, I found that not all coolant reservoirs are created equal. Here’s what I focused on:
Compatibility
I made sure to verify that the coolant reservoir was specifically designed for the 2018 Ram 3500. This ensured that it would fit perfectly and function correctly with my truck’s cooling system.
Material Quality
I paid attention to the materials used in the reservoir. I wanted something durable and resistant to heat and pressure. Most reservoirs I looked at were made from high-quality plastic, but I also checked for any reinforcement features that could enhance longevity.
Brand Reputation
I leaned towards well-known brands with positive reviews from other 2018 Ram 3500 owners. Brands like Dorman and Spectra Premium had numerous testimonials praising their products, which gave me confidence in my purchase.
Where to Buy
I found several options for purchasing a coolant reservoir:
- Local Auto Parts Stores: I visited places like AutoZone and O’Reilly Auto Parts, where I could physically inspect the reservoir.
- Online Retailers: Websites like Amazon and RockAuto provided a wide selection and competitive pricing. I appreciated the convenience of home delivery.
- Dealerships: While more expensive, I considered buying from a Ram dealership for OEM parts, ensuring the best fit and quality.
Cost Considerations
While shopping, I noticed that prices for coolant reservoirs varied widely. I found replacements ranging from $30 to $150. I realized that while I wanted a good deal, I also didn’t want to skimp on quality. It was important for me to balance cost with reliability.
Installation Tips
After purchasing my coolant reservoir, I decided to install it myself. Here are some tips I found helpful:
- Gather Tools: I made sure to have the necessary tools on hand, including pliers, a socket set, and a coolant catch pan.
- Follow a Guide: I watched a few tutorial videos online to familiarize myself with the installation process.
- Check for Leaks: After installation, I ran my engine and checked for any leaks around the new reservoir.
Final Thoughts
In my experience, replacing the coolant reservoir in my 2018 Ram 3500 was a straightforward process that significantly improved my truck’s performance. By paying attention to compatibility, quality, and installation, I ensured that my engine would stay cool and efficient for years to come. If you’re facing similar issues, I hope my guide helps you find the perfect coolant reservoir for your needs!
Author Profile
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I’m Frank Roberts, the writer behind TeuscherMadison.com. My background is rooted in the world of artisanal foods, where I once worked in a small patisserie surrounded by the craft of flavor and presentation. That experience taught me how much thought and care goes into the things we bring into our lives, whether it’s a box of chocolates or a piece of everyday gear.
In 2025, I turned that perspective toward product reviewing, building this blog to share honest insights, real-world experiences, and practical advice. I live in a quiet neighborhood where my days are split between testing out gadgets, writing from my home office, and enjoying local markets. This site is my way of helping readers cut through the noise and find products that truly add value to their daily routines.
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