125 votes
I replaced it with a OEM style koyorad I found for $130 and corrected the radiator caps and my temps have been perfect all summer. It is a bitch to burp the coolant so I recommend buying the spill-free funnel.
The Koyorad full aluminum radiator is the one to have. Paired to your Hayden 698 since it doesn’t have a section to cool the trans fluid, however definitely worth it for durability as the next alternative over OEM replacement rad.
I bought a Koyorad radiator for my 2003 Toyota Sequoia and worked out perfect!
I refused to install anything but a koyorad
My all aluminum Koyorad radiator is a far superior unit than the factory original.
I run the Koyorad 38mm radiator on my NB, with just regular Prestone green concentrate and distilled water 50/50, and OEM Mazda cap and thermostat. Coolant temps stay in the 190's at all times. It very rarely gets above 200 except on the hottest summer days, usually when sitting in traffic.
I went with a Koyorad, but for how much I’ve spent, I should have gone with a crossflow (either Supermiata or Flyin Miata). I also did a coolant reroute, which made me really regret not getting a crossflow
I got the thicker Koyorad and managed to get it to fit with some redneck engineering, but it was a squeeze.
I placed the thicker koyorad in there and fixed a lot of issues, together with hood vents helped me getting my drift car cool.
I have the koyorad myself, bought it used. Spend some time sealing the nose to force all air through the radiator and you'll never have an overheating issue naturally aspirated.
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