Exact thing happened to me last year. Replaced with a Mishimoto
Vehicle:
Honda S2000
Best Engine radiator for Honda S2000
Just dealt with the same thing with my AP1. The plastic to metal seam fails eventually and causes the leak. I got the Koyorad OE replacement and it was around $100 and took an hour to install.
Pros: OE replacement
Cons: plastic to metal seam fails
Vehicle:
Honda S2000
I went with a Koyo radiator, which is considerably better built than the factory piece, cost less than $300 with new hoses, and took maybe 2 hours, start to finish. Of course, I replaced the coolant at the same time.
Pros: better built than factory
Vehicle:
Honda S2000
Replaced it with mishimoto and haven't looked back. Holds much more coolant that OEM and does a much better job cooling.
Pros: holds more coolant, better cooling
Vehicle:
Honda S2000
just replaced rad and all soft and hardlines with oem hoses and koyo rad. gives me a lot of reassurance in this LA heat. Great upgrade
Pros: great upgrade, reassurance in heat
Vehicle:
Honda S2000
The Koyo Rad needs it's own custom cap as the OEM won't fit but man does track city daily without issue and fits OEM fans it's a must have.
Pros: no daily/track issues
Cons: needs custom cap
Vehicle:
Honda S2000
I would recommend the koyo radiator with stock fans. It’s been 3 years with mine zero issues it’ll run cool in 120 desert.
Pros: zero issues, runs cool in desert
Vehicle:
Honda S2000
I've been running a Mishimoto in the racecar for 3 years now with 0 issues and their lifetime warranty including damage during use is hard to beat.
Pros: zero issues, lifetime warranty
Vehicle:
Honda S2000
Mine developed a small slow leak out of that nub two weeks after I bought it. Koyo gave me the run around on their warranty, insisting on photos of a destroyed radiator for replacement. I gave up. It’s a shame because it fit awesome and looked great.
Pros: awesome fit, great look
Cons: developed slow leak, poor warranty service
Vehicle:
Honda S2000
my Mishimoto leaked/falied apx 10-11 years after I bought it. and keep the receipt, or your lifetime warranty will not be valid
Cons: leaked/failed, warranty issues
Vehicle:
Honda S2000
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Top manufacturers of engine radiator for Honda S2000
This part for Honda S2000 is made around the world. We have reviews for engine radiator manufacturers from countries such as: Japan, USA, Taiwan .
In March 2026, the ranking of engine radiator for Honda S2000 on PartReview included 4 manufacturers. It is based on 20 reviews and 62 votes.
Which engine radiator to choose for Honda S2000?
Last month, PartReview users preferred Koyo. 38% of positive votes went to this manufacturer.
In second place: engine radiator MISHIMOTO — 29%.
Third place: TYC with 4% of the votes.
In the overall ranking of engine radiator, which aggregates opinions of owners of different car makes and models, these brands hold the following positions:
- Koyo ranked 1, PR Score — 92. Based on 57 reviews and 173 votes.
- MISHIMOTO ranked 5, PR Score — 65. Based on 95 reviews and 300 votes.
- TYC does not yet have enough reviews to participate in the ranking. You can help by adding a review with the brand and your car model.
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