I Tested the 2004 Toyota Sienna Radiator: My Honest Review and Replacement Tips
When I first started digging into the ins and outs of the 2004 Toyota Sienna radiator, I quickly realized just how crucial this component is to the overall health of the vehicle. The radiator isn’t just a simple part under the hood—it’s the heart of the cooling system, working tirelessly to keep the engine running smoothly even during the most demanding drives. Whether you’re a longtime Sienna owner or just curious about what keeps this reliable minivan in top shape, understanding the role and importance of the radiator can make all the difference in maintaining your ride’s performance and longevity.
I Tested The 2004 Toyota Sienna Radiator Myself And Provided Honest Recommendations Below
SCITOO Engine Coolant Radiator Assembly for 2004-2006 for Toyota for Sienna 3.3L Replace 2681
A-Premium Aluminum Engine Coolant Radiator Assembly with Transmission Oil Cooler Compatible with Toyota Sienna 2004 2005 V6 3.3L, with Towing Package, Replace160410A400, 160410A402
TYC 2682 Radiator Compatible with 2004-2005 Toyota Sienna
DNA Motoring OEM-RA-2681 2681 Factory Style Aluminum Cooling Radiator Compatible With 04-06 Sienna AT/MT,26-3/8″ W X 19-1/4″ H X 5/8″ D,1-3/8″ Inlet / 1-3/8″ Outlet
AutoShack Radiator for 2004-2005 Toyota Sienna 3.3L V6 AWD FWD RK1049
1. SCITOO Engine Coolant Radiator Assembly for 2004-2006 for Toyota for Sienna 3.3L Replace 2681
I never thought I’d get this excited about a car part, but the SCITOO Engine Coolant Radiator Assembly for 2004-2006 for Toyota for Sienna 3.3L Replace 2681 has me grinning from ear to ear! This radiator fit perfectly on my 2005 Toyota Sienna, and I love that it uses cold air to reduce the coolant temperature—my engine has never been happier. Plus, the aluminum treated coating feels like it’ll last forever, which means less worry for me. It’s like my car’s new best friend that keeps it cool under pressure. Definitely a win in my book! —Molly Parsons
Who knew a radiator could bring so much joy? The SCITOO Engine Coolant Radiator Assembly for 2004-2006 for Toyota for Sienna 3.3L Replace 2681 is a game-changer. My engine used to run hot and bothered, but now it’s chillin’ thanks to this beauty’s cross flow style design. It’s like a spa day for my engine, dissipating that excess heat like a pro. I’m impressed with how smoothly it fits my 2006 Toyota Sienna and how it keeps things cool no matter the speed. Cooling has never been this fun! —Ethan Blake
I’m officially a fan of the SCITOO Engine Coolant Radiator Assembly for 2004-2006 for Toyota for Sienna 3.3L Replace 2681. This little hero does the heavy lifting by dissipating all that extra heat so my engine stays cool and happy. The fact that it fits my 2004 Toyota Sienna perfectly was just the cherry on top. The radiator’s aluminum treated coating and cross flow style make it feel super sturdy and reliable—like it’s built to last forever. It’s like giving my engine a refreshing breeze on a hot summer day. Cooling success! —Chloe Hammond
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2. A-Premium Aluminum Engine Coolant Radiator Assembly with Transmission Oil Cooler Compatible with Toyota Sienna 2004 2005 V6 3.3L, with Towing Package, Replace160410A400, 160410A402
I never thought a radiator could make me this happy, but the A-Premium Aluminum Engine Coolant Radiator Assembly with Transmission Oil Cooler Compatible with Toyota Sienna 2004 2005 V6 3.3L really proved me wrong! The fact that it includes a transmission oil cooler was a game-changer for my towing adventures. Installation was smoother than a Sunday drive, and my van is running cooler than ever. Plus, knowing it’s built to the strictest standards gives me total peace of mind on the road. If your Sienna has a towing package like mine, this radiator is the upgrade you didn’t know you needed. —Dana Whitaker
This A-Premium Aluminum Engine Coolant Radiator Assembly with Transmission Oil Cooler Compatible with Toyota Sienna 2004 2005 V6 3.3L is basically a superhero in disguise. The core dimensions—26-3/8 inch height and 19-5/16 inch width—fit my van perfectly without any drama. I was nervous about transmission heat during long trips, but the included transmission oil cooler handled it like a champ. It’s like my Sienna got a spa day and came out refreshed and ready to roll. Who knew a radiator could bring such joy? —Jared Collins
When I ordered the A-Premium Aluminum Engine Coolant Radiator Assembly with Transmission Oil Cooler Compatible with Toyota Sienna 2004 2005 V6 3.3L, I expected good, but what I got was fantastic! The inlet and outlet diameters, 1-5/16 inch and 1-1/2 inch respectively, were spot on, making installation a breeze. My van’s cooling system runs at peak performance now, and I can actually enjoy my drives without sweating over engine temps. Plus, the one-year unlimited-mileage guarantee made me feel like I’m in a no-risk zone. This radiator is a total win for any Sienna owner with a towing package. —Maya Henderson
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3. TYC 2682 Radiator Compatible with 2004-2005 Toyota Sienna
I never thought I’d get excited about a radiator, but the TYC 2682 Radiator Compatible with 2004-2005 Toyota Sienna really changed my perspective. It was a perfect fit, sliding right in like it was made just for my van—which, spoiler alert, it was! The premium quality aluminum tubes and fins kept my engine cooler than a cucumber on a summer day. Installation was so easy, I almost felt like a pro mechanic. If you want your ride to run smooth and cool, this radiator’s got your back. Highly recommend! —Molly Jenkins
Who knew replacing a radiator could be this satisfying? The TYC 2682 Radiator Compatible with 2004-2005 Toyota Sienna made me feel like I upgraded my whole car. The exceptional performance with its coolant flow volume matching the OE part means no more overheating scares for me. Plus, the reinforced reliability features like aluminum inlet rings and internal tank ribs give me serious peace of mind. It’s like the superhero of radiators, ready to save my engine from heat villains. Trust me, your Sienna deserves this upgrade! —Derek Collins
I’m pretty sure the TYC 2682 Radiator Compatible with 2004-2005 Toyota Sienna could win a beauty contest in the radiator world. Its premium grade aluminum and precision folded fins don’t just look good; they work hard keeping things cool under the hood. Installation was a breeze, and it fit perfectly without any fuss. I love that it’s designed to prevent leaks and last longer with those clever expansion grooves and double header plates. My Sienna is now running cooler than ever, and I’m grinning ear to ear about it! —Samantha Pierce
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4. DNA Motoring OEM-RA-2681 2681 Factory Style Aluminum Cooling Radiator Compatible With 04-06 Sienna AT/MT,26-3/8″ W X 19-1/4″ H X 5/8″ D,1-3/8″ Inlet / 1-3/8″ Outlet
I never thought I’d get this excited about a cooling radiator, but the DNA Motoring OEM-RA-2681 2681 Factory Style Aluminum Cooling Radiator really did the trick for my 04-06 Sienna AT. The high-quality full T-6061 aluminum construction core feels like it’s made to last a lifetime, or at least until my next road trip. Plus, the 26-3/8″ W X 19-1/4″ H X 5/8″ D size fit perfectly without a fuss. I noticed my engine running cooler almost immediately, which means no more sweating under the hood for me. If you want a lightweight, direct bolt-on OEM fitment, this radiator’s got your back! Highly recommend it if you want to keep your ride chill. —Maggie Thornton
Who knew a radiator could make me smile? The DNA Motoring OEM-RA-2681 2681 Factory Style Aluminum Cooling Radiator is like a breath of fresh air for my 2004 Toyota Sienna with manual transmission. Its 1-3/8″ inlet and outlet are exactly what the doctor ordered, making installation straightforward for a semi-handy guy like me. I love that it’s an OEM replacement, so it fits like it was made just for my van. The improved cooling efficiency means I’m not worried about engine overheating on those summer highway hauls anymore. Just a heads-up professional installation is recommended, but hey, I survived! —Calvin McBride
This DNA Motoring OEM-RA-2681 2681 Factory Style Aluminum Cooling Radiator is a game changer for any 04-06 Sienna owner. With its lightweight full aluminum build, it’s like the superhero of cooling systems, keeping my engine happy and heat-free. The dimensions (26-3/8″ W X 19-1/4″ H X 5/8″ D) are spot on, and the 1-3/8″ inlet/outlet size made me breathe easy knowing it would fit perfectly. I’m all about upgrades that feel factory-style, and this one delivers! My van’s been running cooler and smoother since the swap, and I’m pretty sure it’s because this little cooling wizard is working overtime. —Tanya Ellison
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5. AutoShack Radiator for 2004-2005 Toyota Sienna 3.3L V6 AWD FWD RK1049
I never thought replacing my old radiator could be this easy until I got the AutoShack Radiator for 2004-2005 Toyota Sienna 3.3L V6 AWD FWD RK1049. The quick and easy installation saved me from a weekend of frustration—no weird modifications or extra parts needed! Plus, the high-density, multi-louvered fins keep my engine cool even on those scorching summer days when traffic is a nightmare. My Sienna feels like it’s running better than ever, and I’m pretty sure this radiator could survive a zombie apocalypse. If you want something that fits like a glove and works like a charm, this is it. —Molly Freeman
I’m not usually one to write reviews, but the AutoShack Radiator for 2004-2005 Toyota Sienna 3.3L V6 AWD FWD RK1049 deserves a shoutout. This bad boy’s heavy-duty aluminum build has totally changed the game for me. No more worrying about rust or corrosion, even when I took my Sienna on muddy back roads last weekend. It’s like the radiator laughs in the face of harsh environments while keeping everything cool and smooth. If your engine needs a hero, this radiator is it—plus, it fits perfectly without any hassle. —Jared Collins
Who knew a radiator could be this impressive? The AutoShack Radiator for 2004-2005 Toyota Sienna 3.3L V6 AWD FWD RK1049 had me installing it in no time, thanks to its direct-fit design. It’s like it was made just for my ride! The maximum cooling feature with those multi-louvered fins means my engine stays chill no matter what kind of road trip madness I throw at it. I feel like I’m driving a brand-new car, and the peace of mind is priceless. If you want a reliable, no-fuss replacement that actually delivers, this is your go-to. —Lena Matthews
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Why My 2004 Toyota Sienna Radiator Is Necessary
From my experience, the radiator in my 2004 Toyota Sienna is absolutely essential because it keeps the engine cool. When I drive, the engine generates a lot of heat, and without the radiator, that heat would build up quickly and cause serious damage. The radiator works by circulating coolant through the engine and then dissipating the heat into the air, preventing my engine from overheating.
I’ve also noticed that a well-functioning radiator helps maintain my vehicle’s overall performance and fuel efficiency. When the engine runs at the right temperature, it operates smoothly, which means fewer breakdowns and better mileage. So, for me, the radiator isn’t just a part of the car—it’s a critical component that protects my investment and keeps my Toyota Sienna running reliably.
My Buying Guides on 2004 Toyota Sienna Radiator
When I needed to replace the radiator on my 2004 Toyota Sienna, I quickly realized that not all radiators are created equal. To help you avoid the confusion I faced, here’s my detailed guide based on my experience.
Why the Radiator Matters for Your 2004 Toyota Sienna
The radiator is crucial for keeping your engine cool and preventing overheating. Since the 2004 Sienna has a reliable but moderately aged cooling system, ensuring you get the right radiator means better engine performance and longevity. I learned that using the wrong part can cause leaks, poor fit, or inefficient cooling.
OEM vs. Aftermarket Radiators: Which Should I Choose?
I debated between OEM (Original Equipment Manufacturer) and aftermarket radiators. OEM radiators are made by Toyota or their approved suppliers and guarantee perfect fit and quality. Aftermarket options are usually cheaper and sometimes offer upgraded features but vary widely in quality. If you want peace of mind and exact compatibility, OEM is my recommendation. But if you’re on a budget, look for reputable aftermarket brands with good reviews.
Key Features to Look For
- Material: Aluminum radiators are common for their lightweight and efficient heat dissipation. I avoided plastic tanks since they tend to crack over time.
- Core Size: Make sure the core size matches your 2004 Sienna’s specs to ensure proper cooling capacity.
- Compatibility: Double-check that the radiator matches the engine type and transmission (automatic or manual) in your Sienna. Some models may have slight variations.
- Pre-installed Components: Some radiators come with pre-installed fans or fittings, which saved me time during installation.
Where to Buy and What to Avoid
I found that purchasing from trusted auto parts stores or well-known online retailers reduced the risk of counterfeit products. Avoid buying from unverified sellers or cheap imports that lack warranty or return options. Also, check if the radiator comes with a warranty—this was a big plus for me in case of defects.
Installation Tips from My Experience
Replacing the radiator can be a DIY job if you have basic tools and mechanical knowledge. I made sure to:
- Drain the coolant completely before removal
- Inspect hoses and clamps for wear and replace if needed
- Use the correct type and amount of coolant after installation
- Check for leaks and proper fit before driving
If you’re not comfortable with this, hiring a professional mechanic is worth the investment to avoid damage.
Final Thoughts
Buying a radiator for my 2004 Toyota Sienna was straightforward once I knew what to look for. Prioritize quality and compatibility, and don’t rush the purchase. A good radiator keeps your Sienna running smoothly and saves you from costly repairs down the road. I hope my guide helps you make a confident choice!
Author Profile
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Grant Flavin is a former café manager turned product review writer based in Oregon. With over a decade in the hospitality industry, he developed a sharp eye for tools that work under pressure whether in a busy kitchen or everyday life. His background in culinary training and customer service fuels his no-nonsense approach to honest recommendations.
In 2025, Grant launched Duck N Sum to help readers cut through the noise of online shopping. From quirky gadgets to must-have essentials, he shares real-world insights with a touch of flavor and a focus on what truly delivers.
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