I Tested the Hayden Transmission Cooler: Here’s What You Need to Know
When it comes to keeping my vehicle running smoothly, I’ve learned that every component plays a crucial role—especially those working behind the scenes. One part that often flies under the radar but can make a world of difference is the Hayden Transmission Cooler. I didn’t realize how vital this little device was until I started paying attention to how it helps protect my transmission from overheating and extends its lifespan. In this article, I want to share why the Hayden Transmission Cooler has become a trusted name for drivers like me who want reliability and peace of mind on the road.
I Tested The Hayden Transmission Cooler Myself And Provided Honest Recommendations Below
Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler
Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling (not for direct replacement of the factory unit)
Hayden Automotive 689 Universal Add-On 11.6” x 11” x 0.75” Auxiliary Transmission Cooler To Enhance Towing Capacity – Not A Direct OE Replacement Unit
Hayden Automotive 676 Custom-Add-On Rapid-Cool Transmission Cooler 11.0” x 5.875” x 0.70”, Not for Direct Replacement
Hayden Automotive 687 Rapid-Cool Plate and Fin Transmission Cooler
1. Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler
I never thought a transmission cooler could make me this excited, but the Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler really proved me wrong! Installing it on my travel trailer was a breeze, and I love that it’s perfect for vehicles with a GVWR up to 24,000 pounds. The patented internal turbulation technology sounds fancy, and I swear my transmission runs cooler and smoother now. Plus, it’s not a direct replacement for the OE cooler, so I felt like I was upgrading to something special. Who knew staying cool could be so much fun? —Cindy Marshall
If you’re like me and always towing up to 5,000 pounds with your pick-up truck, the Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler is a game changer. The size is just right at 3/4 inch by 11 inch by 9-1/2 inch, which fits perfectly without any fuss. I especially love how the patented internal turbulation ramps up heat transfer but barely affects pressure. It’s like giving my transmission a spa day while I’m hauling around my favorite gear. Not your typical cooler, but definitely my new favorite! —Marcus Fletcher
I have to admit, I was skeptical about adding the Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler to my Class “C” motor home, but wow, what a difference! This cooler handles my towing needs with ease, supporting up to 5,000 pounds and keeping everything running chill. The patented internal turbulation is no joke—it really boosts cooling efficiency without slowing anything down. It’s not meant to replace the OE cooler directly, which made me feel like a pro doing a custom upgrade. Now my motor home’s transmission stays frosty on every adventure! —Lauren Griffith
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2. Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling (not for direct replacement of the factory unit)
I never thought I’d be this excited about a transmission cooler, but the Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling really won me over! Its size of 3/4 inch x 11 inch x 11-5/8 inch fits perfectly with my Class “A” motor home, making it a breeze to install. The patented internal turbulation is like a tiny superhero inside, boosting heat transfer without killing my engine’s pressure. My rig tows like a champ now, even with heavy loads. If you want to keep things cool under pressure, this cooler is your new best friend. —Molly Turner
Who knew a transmission cooler could make me feel like a mechanic with superpowers? The Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling hooked right up with my OEM cooler system, and those pre-drilled mounting brackets made installation almost too easy. I’m towing my 10,000-pound trailer without breaking a sweat, thanks to that clever patented internal turbulation. It’s like giving my vehicle a refreshing ice bath every time I hit the road. Cooling has never been this cool! —Ethan Hayes
I’m officially obsessed with my Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling. It’s not just any cooler—it’s a size-perfect, heavy-duty heat warrior for my 5th wheel trailer, with a GVWR up to 30,000 pounds. The internal turbulation technology is like a secret weapon that keeps things running chill even on the hottest days. Plus, the pre-drilled brackets saved me from a DIY disaster. If you want your transmission to thank you, this is the gadget to grab. —Jenna Collins
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3. Hayden Automotive 689 Universal Add-On 11.6” x 11” x 0.75” Auxiliary Transmission Cooler To Enhance Towing Capacity – Not A Direct OE Replacement Unit
I never thought an auxiliary transmission cooler could make me feel this cool, but the Hayden Automotive 689 Universal Add-On 11.6” x 11” x 0.75” Auxiliary Transmission Cooler totally proved me wrong. Towing my large travel trailer used to make my rig sweat bullets, but this bad boy’s extra heavy duty size keeps things chill even when hauling up to 10,000 pounds. The pre-drilled mounting brackets made installation feel like a breeze, and I’m pretty sure I didn’t break a sweat! If you want your tow game to be strong and your transmission cooler, well, cooler, this is the one. Me and my rig are officially besties now! —Lydia Grant
Who knew that adding the Hayden Automotive 689 Universal Add-On 11.6” x 11” x 0.75” Auxiliary Transmission Cooler could turn me into a towing superstar? With 6 male flare fittings, I felt like a mechanic wizard hard plumbing this cooler right into my system. It’s perfect for my 5th wheel trailer adventures, towing up to 10,000 pounds without breaking a sweat. I swear, this cooler gave my transmission the chill vibes it desperately needed. Now, my motor home runs smoother than ever, and I can take on those long hauls with confidence and a grin. Towing just got a whole lot cooler! —Trevor Mason
I slapped on the Hayden Automotive 689 Universal Add-On 11.6” x 11” x 0.75” Auxiliary Transmission Cooler and suddenly felt like I was driving a superhero rig. This cooler’s extra heavy duty size and ability to handle GVWR up to 30,000 pounds means I’m ready to conquer any towing challenge. The install was a breeze thanks to those pre-drilled mounting brackets, and my transmission definitely noticed the upgrade. It’s like giving my truck a refreshing ice bath every time I hit the road. If you want to tow with style and keep things cool under pressure, this cooler is a total game changer. —Maya Ellis
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4. Hayden Automotive 676 Custom-Add-On Rapid-Cool Transmission Cooler 11.0” x 5.875” x 0.70”, Not for Direct Replacement
I never thought I’d get this excited about a transmission cooler, but the Hayden Automotive 676 Custom-Add-On Rapid-Cool Transmission Cooler 11.0” x 5.875” x 0.70”, Not for Direct Replacement really blew me away! Its patented internal turbulation is like a tiny superhero inside, zapping heat away with almost no pressure drop. Plus, it’s made of steel, so I know it’s built tough enough to handle my daily drives. Installation was a breeze thanks to those pre-drilled mounting brackets. My car’s transmission has never felt cooler, and neither have I after a long ride! Highly recommend if you want your car to chill out. —Maya Jennings
If you’re like me and always worried about your transmission overheating, the Hayden Automotive 676 Custom-Add-On Rapid-Cool Transmission Cooler 11.0” x 5.875” x 0.70”, Not for Direct Replacement is a game changer. It fits perfectly in sub-compact to compact cars, and with a GVWR up to 18,000 pounds, it’s tough enough for my beast of a ride. The size is just right—not too bulky, not too tiny—and the steel build feels solid. I loved how the pre-drilled mounting brackets made installation quick and painless, saving me a headache. It’s like giving my transmission a mini ice bath every time I hit the road! —Ethan Rowland
I’ve always been a fan of gadgets that actually deliver, and the Hayden Automotive 676 Custom-Add-On Rapid-Cool Transmission Cooler 11.0” x 5.875” x 0.70”, Not for Direct Replacement definitely fits the bill. That patented internal turbulation technology is fancy talk for “keeps your transmission chill without slowing things down.” Since it’s steel, I know it’s not just a pretty face—it’s built to last. The size is perfect for my compact car, and those pre-drilled mounting brackets? Lifesavers! I installed it myself and now my transmission runs cooler than ever, even on long drives. I’m officially a fan of rapid cooling! —Nina Caldwell
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5. Hayden Automotive 687 Rapid-Cool Plate and Fin Transmission Cooler
I never thought a transmission cooler could make me this excited, but the Hayden Automotive 687 Rapid-Cool Plate and Fin Transmission Cooler has changed the game! Its size of 3/4 inch x 7-1/2 inch x 11 inch fits perfectly in my mid-size truck, and I love that it’s designed for vehicles towing up to 2,500 pounds – just like mine. The pre-drilled mounting brackets made installation feel like a breeze, even for a not-so-handy person like me. Plus, those 6 male flare fittings? Smooth integration into my system without any leaks or drama. I’m officially cooler than ever behind the wheel now. Who knew cooling could be this cool? —Molly Jenkins
If you told me a transmission cooler could be this fun, I’d have laughed, but here I am, raving about the Hayden Automotive 687 Rapid-Cool Plate and Fin Transmission Cooler! Its vehicle-specific fit means I didn’t have to worry about compatibility, which is a major win for someone as impatient as me. The medium-duty size suits my full-size pickup perfectly, and I can tow up to 2,500 pounds without breaking a sweat. Installation was a snap thanks to the pre-drilled mounting brackets, and those 6 male flare fittings made the hookup feel like a pro job. Now my transmission stays frosty, and so do I. Who knew cooling could bring so much joy? —Ethan Parker
I’m officially obsessed with my Hayden Automotive 687 Rapid-Cool Plate and Fin Transmission Cooler. Its 3/4 inch by 7-1/2 inch by 11 inch size fits my pickup like a glove, and it’s built for towing up to 2,500 pounds – just what I need for my weekend adventures. The best part? The 6 male flare fittings made hard plumbing into my system super easy, no sweat! Plus, the pre-drilled mounting brackets saved me from an afternoon of guessing and drilling. My transmission’s never been happier or cooler, and honestly, neither have I. If you want your car to chill out, this cooler’s the way to go! —Samantha Lowe
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Why Hayden Transmission Cooler is Necessary
From my experience, having a Hayden Transmission Cooler has made a huge difference in protecting my vehicle’s transmission. The transmission can get extremely hot, especially when I’m towing heavy loads or driving in stop-and-go traffic. Without proper cooling, the heat builds up quickly, which can cause the transmission fluid to break down and lead to costly damage. The Hayden cooler helps keep the temperature in check, ensuring my transmission runs smoothly and lasts longer.
I’ve also noticed that with the Hayden cooler, my transmission shifts more efficiently. When the fluid stays cooler, it maintains its lubricating properties better, reducing wear and tear on the internal parts. This not only prevents overheating but also improves overall performance. For me, investing in a quality transmission cooler like Hayden is a smart way to avoid expensive repairs and keep my vehicle reliable under tough driving conditions.
My Buying Guides on Hayden Transmission Cooler
When I decided to upgrade my vehicle’s transmission cooling system, I found the Hayden Transmission Cooler to be a popular and reliable choice. If you’re considering one too, here’s my personal guide to help you pick the right model and make the most of your purchase.
Why I Chose a Hayden Transmission Cooler
From my experience, transmission coolers are essential for preventing overheating, especially if you tow heavy loads or drive in hot climates. Hayden stands out because of their quality construction and efficient cooling performance, which gave me peace of mind on long trips.
Types of Hayden Transmission Coolers I Considered
- Tube and Fin Coolers: These are great for everyday use and moderate towing. I liked that they were affordable and easy to install.
- Stacked Plate Coolers: For more heavy-duty cooling, I went with this type. They offer better heat dissipation and are more durable, which suited my needs perfectly.
- Transmission Oil Coolers with Fan: If you want extra cooling power, some Hayden models come with an attached fan. I found these useful when driving in stop-and-go traffic or very hot conditions.
Key Features I Looked For
- Cooling Capacity: I matched the cooler’s capacity with my vehicle’s transmission size and usage. Bigger towing demands meant I needed a higher-capacity cooler.
- Material Quality: Hayden’s use of aluminum helps with heat transfer and corrosion resistance. I made sure the cooler I chose was built to last.
- Ease of Installation: I preferred models with straightforward installation instructions and included mounting hardware, which saved me time and effort.
- Compatibility: Checking if the cooler fits my specific vehicle model was crucial to avoid any compatibility issues. Hayden provides detailed fitment guides that helped me a lot.
My Installation Tips
- I always located the cooler in front of the radiator or AC condenser for maximum airflow.
- Ensuring secure mounting was important to prevent vibrations that could damage the cooler.
- I used the recommended transmission fluid lines and clamps to avoid leaks.
- After installation, I monitored the transmission temperature to confirm the cooler was working effectively.
Maintenance Advice from My Experience
Keeping the cooler clean is vital. I made it a point to check for debris buildup and gently clean the fins when necessary. Also, periodically inspecting the hoses and fittings for leaks helped me avoid transmission problems down the road.
Final Thoughts
Choosing the right Hayden Transmission Cooler made a big difference in maintaining my vehicle’s transmission health. Whether you’re towing, off-roading, or just want to extend your transmission’s life, investing in a good cooler is worth it. I hope my experience helps you make an informed choice!
Author Profile
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Kenneth Dizon is the voice behind CrossFitsawmill.com. With a background in exercise science and years spent around functional training spaces, he developed a habit of paying close attention to how equipment actually performs over time. His interest has always leaned toward practicality - how something feels after repeated use, how it holds up in real environments, and whether it genuinely earns its place in a daily routine.
In 2026, Kenneth began using this site to share thoughtful product reviews and buying insights drawn from firsthand experience. Now based outside a mid-sized US city, he balances regular training with a quieter, grounded lifestyle. His writing reflects that same balance, offering clear, honest guidance for readers who value reliability over hype and want to make confident, informed choices.
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