125 votes
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.
Koyorad if you want good OEM fitment and a fucking drain bung plus good cooling even for modified engines (we’ve put a bunch of the larger alloy ones into rx7’s)
im steady at 75°C (167°F) with stock Ka, koyorad radiator, fanshroud and oe/oestyled clutch fan. and iirc, a stock nissan thermostat. hottest ive seen was like 89°C (192°F) and that was sitting in traffic on a hot summer day. idk how im running so cold lol.
I went with the Koyorad on mine. Everything fit perfectly, no modifications needed, which hasn't always been the case for me
Ive had my car enter limp mode multiple times on a high 80 track days. Coolant temp would spike to the 3/4 marks. When I upgraded the radiator to a koyorad I never had issues again.
I am here to say the Koyorad fits perfectly fine with Cobb’s charge pipe. The upper radiator hose had to be completely taken out to get the pass side fan installed but no trimming or cutting of fan shroud. The radiator looks amazing as well.
Experienced a full separation of the top (and possibly bottom) plastic from the aluminum portion - would leak about as fast as I could pour it in. Replaced with Koyorad A2807 from RockAuto.com for $104 plus tax and shipping. Nominal time to repair for a non-mechanic is probably 4-to-6 hours - call it a day project.
got a Koyorad off Rock Auto for around $100 and slapped it in there. Runs like a champ. It is a pretty easy job if you're mechanically inclined.
I've had a Koyorad in my 97 for 5 years now and it's been great.
i recently put a koyorad in mine as well, the hoses at the bottom took me forever to work with but it was worth it
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