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Bad experience with Koyorad radiator #3737446 05/21/15 09:46 PM
Joined: Apr 2013
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mclasser Offline OP
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After reading rave reviews about Koyorad on different forums, I decided to get one to replace the leaking unit in my I35. After installing it, I went to fill up coolant when I noticed fluid leaking out of the top seam underneath the upper rad hose. Quality control must've been half asleep when they waved this radiator through because it was obvious the seam wasn't crimped enough.

So after all that work and getting coolant and ATF all over myself, I had to take out the POS unit and send it back. Bought another company's rad from Advance Auto Parts and it's working fine. Just my luck having a bad experience with a supposedly great quality product frown

Last edited by mclasser; 05/21/15 09:51 PM.

2018 Hyundai Elantra VE
2013 Honda Pilot EX-L 4WD
2002 Honda Accord EX-L

Re: Bad experience with Koyorad radiator [Re: mclasser] #3737453 05/21/15 10:05 PM
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mongo161 Offline
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Well, unfortunately, these things will happen.....


I get by with a little help from my friends....listen with your eyes....it's the ONLY way to believe what you hear...
Re: Bad experience with Koyorad radiator [Re: mclasser] #3737461 05/21/15 10:19 PM
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Kool1 Offline
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I have a Koyo radiator sitting in my garage waiting for me to find time to change it in my 2003 Honda CRV which has 175,000 miles. The CRV has the original Honda radiator made in Japan by Denso with no leaks.

The replacement Koyo I have is made in China. I am considering selling my China made Koyo after reading this.

Yesterday I was at my local Honda dealer and saw someone purchase a radiator for their CRV and it was a Denso radiator made in United Kingdom. He paid over $400.00 for the radiator!!! My Koyo was about $60.00.

Re: Bad experience with Koyorad radiator [Re: Kool1] #3737469 05/21/15 10:26 PM
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bvance554 Offline
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Originally Posted By: Kool1
I have a Koyo radiator sitting in my garage waiting for me to find time to change it in my 2003 Honda CRV which has 175,000 miles. The CRV has the original Honda radiator made in Japan by Denso with no leaks.



Why are you looking to change it if its not leaking?

Re: Bad experience with Koyorad radiator [Re: bvance554] #3737472 05/21/15 10:30 PM
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GiveMeAVowel Offline
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Originally Posted By: bvance554
Originally Posted By: Kool1
I have a Koyo radiator sitting in my garage waiting for me to find time to change it in my 2003 Honda CRV which has 175,000 miles. The CRV has the original Honda radiator made in Japan by Denso with no leaks.



Why are you looking to change it if its not leaking?


Plastic tank rads like this are well known to fail around 15 years or 150k miles. They usually start leaking at the top seam with the aluminum is crimped, also another weak point in the top hose neck where the fill neck is also located, they usually crack there from age, heat and pressure stress, it is better to swap out and do preventative maintenance than have it suddenly fail out on the road.

Re: Bad experience with Koyorad radiator [Re: bvance554] #3737475 05/21/15 10:34 PM
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Kool1 Offline
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I plan on driving to Las Vegas this summer which means I'll be driving through Death Valley when it sometimes gets up to 115 degrees. With 175,000 miles on the radiator, I don't feel comfortable with the radiator holding up as I've had two other family member's radiators start leaking at about 120,000 miles when the cooling system was strained. I look at changing the radiator as cheap insurance against a radiator failure.

Re: Bad experience with Koyorad radiator [Re: Kool1] #3737481 05/21/15 10:38 PM
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GiveMeAVowel Offline
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Originally Posted By: Kool1
I plan on driving to Las Vegas this summer which means I'll be driving through Death Valley when it sometimes gets up to 115 degrees. With 175,000 miles on the radiator, I don't feel comfortable with the radiator holding up as I've had two other family member's radiators start leaking at about 120,000 miles when the cooling system was strained. I look at changing the radiator as cheap insurance against a radiator failure.


Look into the Denso "First Time Fit" line. Pretty reasonable prices and OEM quality.

Re: Bad experience with Koyorad radiator [Re: mclasser] #3737512 05/21/15 11:19 PM
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Chris142 Online Content
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Koyo is one of the better brands. Only have a 3% or so failure rate which is very good. BTW the denso first time fit are also made in China now.

I'm wondering if there's only 1 or 2 factories and every body buys from them. Seems that way with water pumps.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Bad experience with Koyorad radiator [Re: mclasser] #3737525 05/21/15 11:44 PM
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garlicbreadman Offline
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Im a fan of CSF radiators. 65k miles and 5 years later, still looks new. The plastic top is still very black. When the black plastic starts to fade and turn brown, it's a good idea to change it out.

here is a perfect example

Re: Bad experience with Koyorad radiator [Re: mclasser] #3737532 05/22/15 12:18 AM
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user52165 Offline
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Originally Posted By: mclasser
After reading rave reviews about Koyorad on different forums, I decided to get one to replace the leaking unit in my I35. After installing it, I went to fill up coolant when I noticed fluid leaking out of the top seam underneath the upper rad hose. Quality control must've been half asleep when they waved this radiator through because it was obvious the seam wasn't crimped enough.

So after all that work and getting coolant and ATF all over myself, I had to take out the POS unit and send it back. Bought another company's rad from Advance Auto Parts and it's working fine. Just my luck having a bad experience with a supposedly great quality product frown


Always test fill with water before installation.

Re: Bad experience with Koyorad radiator [Re: GiveMeAVowel] #3737533 05/22/15 12:27 AM
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mongo161 Offline
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Look into the Denso "First Time Fit" line. Pretty reasonable prices and OEM quality. [/quote]

+1....Rock Auto carries the Denso.


I get by with a little help from my friends....listen with your eyes....it's the ONLY way to believe what you hear...
Re: Bad experience with Koyorad radiator [Re: mongo161] #3737550 05/22/15 01:48 AM
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michaelluscher Offline
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Originally Posted By: mongo161

Look into the Denso "First Time Fit" line. Pretty reasonable prices and OEM quality.


+1....Rock Auto carries the Denso. [/quote]

+1 on Denso FTF products
RockAuto is a good place, but if you need it tomorrow and have Prime, cross check the part # on Amazon.


2006 Toyota Camry SE V6

131k
Re: Bad experience with Koyorad radiator [Re: mclasser] #3737571 05/22/15 03:17 AM
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NHGUY Offline
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Stay away from Spectra Premium!

Re: Bad experience with Koyorad radiator [Re: Kool1] #3737584 05/22/15 04:04 AM
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Nukeman7 Offline
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Originally Posted By: Kool1
I have a Koyo radiator sitting in my garage waiting for me to find time to change it in my 2003 Honda CRV which has 175,000 miles. The CRV has the original Honda radiator made in Japan by Denso with no leaks.

The replacement Koyo I have is made in China. I am considering selling my China made Koyo after reading this.

Yesterday I was at my local Honda dealer and saw someone purchase a radiator for their CRV and it was a Denso radiator made in United Kingdom. He paid over $400.00 for the radiator!!! My Koyo was about $60.00.


Don't worry about the Koyorad unit. I put the exact same part no. Koyorad in my 2003 Honda Element last month and it is every bit as good as the Honda OEM (Denso) radiator it replaced.

Re: Bad experience with Koyorad radiator [Re: Nukeman7] #3737669 05/22/15 06:40 AM
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Kira Offline
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"Holy Uniformity garlicbreadman" the top tank of that radiator looks like it was cast that color!

Are you saying the radiator in the picture has faded from black to that even color tan?

Actually, the feature of a heat stressed part indicating its age with a color change would be a cool feature. Kira

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