Mishimoto
Mountain Pass
Joined: Jan 2005
Posts: 107
Likes: 2
From: Flower Mound, TX
I have had mine 2 years and only 25k miles but no issues. The stock one failed about 60k miles.
Logistics Pro
Joined: Mar 2005
Posts: 3,522
Likes: 2,474
From: West Michigan
there have been numerous guys who have replaced in 2011 and up with a Mishi, and still have had radiator leaks. Not sure what causes or why, but for the money they cost, I'd be po'd to have the similar well-known failure.
Junior User
Joined: Aug 2012
Posts: 76
Likes: 1
Factory radiator started leaking at around 38k, 1st Mishimoto lasted ~24k, 2nd Mishimoto started dripping after ~7k. To be fair, I'm not 100% sure it's the radiator dripping, but now with drips on both sides.
Dripping is random, sometimes a lot, sometimes a little. Mainly on passenger side this time. Drove ~400 miles yesterday and had a little drip while unloading the camper. Drove another 125 miles unloaded, and had a big puddle after a few minutes. Drips off the radiator were cooler than ambient temp, makes no sense. Will be changing it out over Labor Day.
Dripping is random, sometimes a lot, sometimes a little. Mainly on passenger side this time. Drove ~400 miles yesterday and had a little drip while unloading the camper. Drove another 125 miles unloaded, and had a big puddle after a few minutes. Drips off the radiator were cooler than ambient temp, makes no sense. Will be changing it out over Labor Day.
Posting Guru
Joined: Dec 2015
Posts: 1,040
Likes: 9
Mishimoto has said they suspect worn cab to frame bushing cause excessive flex. However, someone had a leak and reported their bushing were good, so who knows? But it is interesting Diamond's leaks get more frequent with age.
Junior User
Joined: Aug 2012
Posts: 76
Likes: 1
I'm not about the cab bushings being the problem. Mine don't appear to be, at least visually. Truck's just over 88k now, mostly highway, a little rough/off road. If that was the root cause I would imagine the farm and oil service guys would be having more issues I would think. It seems some trucks leak, and others don't.
The radiator is supported from the top in bushings. It just is located by "pins" at the bottom, not secured. Was thinking though if it is a cab bushing problem, would cross bracing between the tanks prevent it from racking and keep the entire radiator square no matter how much the bushings flex?
Gonna take a closer look at things while I have it torn down.
The radiator is supported from the top in bushings. It just is located by "pins" at the bottom, not secured. Was thinking though if it is a cab bushing problem, would cross bracing between the tanks prevent it from racking and keep the entire radiator square no matter how much the bushings flex?
Gonna take a closer look at things while I have it torn down.
Posting Guru
Joined: Dec 2015
Posts: 1,040
Likes: 9
How much of a job is that? I guess I could look for videos. Found Mishimoto's video and wow! Makes me wonder if I would even trust my Ford dealer to do it.
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Junior User
Joined: Aug 2012
Posts: 76
Likes: 1
It can be done in about 5 hours. Last time I did it was on New Years day in the driveway. Took all day, but at least it did warm up to 27 that afternoon :-)
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Junior User
Joined: Jan 2017
Posts: 88
Likes: 0
The dealer wanted $700 for the stock radiator and Amazon had the Mishimoto with free prime 2 day shipping for $800 so I felt the lifetime warranty was worth the extra $100 even if I end up spending another 4 hours replacing it in a few years. I've only put about 8,000 miles since install so can't speak to much yet.
6.7 Weight Loss
Joined: Jun 2017
Posts: 1,141
Likes: 5
From: Woodbury CT
Did Mishimoto replace the 2 radiators under their lifetime warranty?
Junior User
Joined: Aug 2012
Posts: 76
Likes: 1
Yep, $100 to ship each time and of course I had to change them out. They want pictures of the leak which means you have to remove. They will send out a replacement before hand after you sign a contract. Then you have about 30 days to send in the pictures.
This will be the last Mishimoto radiator installed in this truck. Hopefully it's because its the last radiator needed
This will be the last Mishimoto radiator installed in this truck. Hopefully it's because its the last radiator needed
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