Engine radiator MISHIMOTO or Koyo

installed a koyo radiator. Very beautiful fitment

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.

Car came with a mishimoto radiator with the shroud and fans. The car handles Texas heat pretty well during autox events.

I did a Koyorad in mine and it was pretty straightforward. No complaints whatsoever

I bought a Koyo OEM replacement (not the bigger Race version). Absolutely perfect fitment.

I highly recommend Mishimoto, I've had it on mine for a couple years, never overheated or issues with anything. Plus great warranty!

i bought a mishimoto. Everything's fine, adequate stock replacement with a stock fitment.

when installing it with the OEM rubber hangers, I had to persuade the radiator into place with some lag bolts. It definitely doesn't go in like the stock one; looks like the end tanks on the Mishimoto unit hit in several places, preventing it from seating exactly where the original goes.

The problem I'm running in to is that the upper hose connection is positioned differently on the Koyo N-Flow/dual pass(RH020539N) and it's really close to the Q45 throttle body and attached TPS. I've already cut off the unused socket on the TPS which gives me more room but still not a ton to work with.

I recently installed a Koyo radiator in my s13 to replace the stock one that had been leaking. I bled the air thoroughly when I filled the system with a spill free funnel and the bleed screw on the water outlet. Even after doing this, my car started overheating intermittently after driving around for a bit. When I stopped, the upper hose and radiator were very hot but the lower hose was cool to the touch. I tried to bleed more air out of it with the spill free funnel, but no air came out, and the water in the funnel started getting hot and overflowing. I pulled the thermostat to verify if it's functioning properly and it is, also it's the type that will stay open in the event of failure. This might seem silly, but I feel like the thermostat is closing and opening because the radiator is cooling too well.