Originally Posted by SanDiegoPowerStroke
I purchased a Mishimoto radiator for my 2008 6.4L F250 about a year ago now. The first version failed after 6 months or so of use. When I contacted customer service to submit my warranty claim, they let me know that this was a known issue with their radiators on the 6.4L Fords and that they had developed a version 2 "V2" (you'll notice that on the end of their part number on their website). This second version was made with rubber mounting posts and stronger plates to help dampen the vibrations from the truck and strengthen the unit to prevent failure.
Warranty exchange was easy, fill out a form, take some pictures, recycle the old failed radiator...that's about it. Oh, yeah, there's also the trouble of having the new replacement radiator installed...taking it somewhere and paying a hefty fee for labor (or if you are skilled, spending a few hours to do it yourself) and buying new coolant. Warranty exchange easy, install not so easy.
After I got the second version installed (the new and improved super radiator, destined for greatness, and much better than the original version) I was feeling bullet proof again. Until it failed, just like the first one. So now I am on my third radiator that has failed (the original OEM, the Mishimoto version 1, and now the Mishimoto version 2). And I am in the process of submitting another warranty claim with Mishimoto...
I was told by a Mishimoto customer service rep that they have had so many reported failures and warranty claims on the 6.4L radiators that they actually purchased one of their customer's F250 trucks to perform testing and research as to what is causing the failures so that they can try and fix it. So, I guess for now, I'll get another V2 until that fails 6 months from now, and hope and pray that the V3 is completed by that time. And that the next version actually lasts for more than 10K miles.
2008 F250 V8 6.4L
I'll start by apologizing for the repetitive failures you have experienced. As you noted, we have had two different radiator designs for the 6.4L, with our newest being the V2 shown on our site. One thing to keep in mind is that this issue begins with the 6.4L truck/chassis. Radiator failures are very common with this truck and we have been working diligently to offer a more durable solution than what the factory has to offer. Our first iteration solved the issue for numerous customers. That being said, we still had a small sample of individuals seeing failures after swapping to our radiator. We investigated potential reasons for failure, and enhanced our initial design. This included strutted internal tubes for added strength, rubber mounting pegs for improved isolation, and thicker core supports for improved resistance to flex.
So far, this V2 design has been quite successful. Many of our customers are very pleased, and the results are positive. A few existing customers have experienced failures with the V2 design. We take this very seriously, and have been carefully evaluating each failure reported. We do own a 6.4L and have been working to inspect additional possible causes for frequent radiator failure. Although we have solved the issue for countless customers, we won't stop until every truck has an available radiator solution.
Again, I apologize that you experienced a failure with our V2 design. Please work with our warranty team to acquire a replacement, and please answer their questions regarding the truck use, upgrades, maintenance, etc.
As previously noted, our V2 design is very effective and has been a great addition to many 6.4L trucks. For that small group still experiencing issues, we are actively inspecting causes for continued failure.