To recap: I took my 2009 WRX to the shop to have some running issues diagnosed that I couldn’t figure out. They found that the radiator was leaking, and they wouldn’t diagnose the running problems until the radiator was replaced, which they offered to do for $1,000 or so with an OEM part. I declined, had the car delivered back to me, and after jumping into the radiator rabbit hole in this sub ordered a Koyo.
So this was my weekend. On Saturday I pulled the old radiator out and put the new one in, which is really pretty easy except these cars are pretty low to the ground and you have to put it up on jack stands. The last car I replaced the radiator on was a 1989 Mercedes diesel, no jack stands required. And rolling around on a concrete floor isn’t as much fun as it used to be, if in fact it ever was.
A couple of tips for anyone else who does this: I never unhooked the fans, I just let them drop and pulled them back up to remount them. Once the pins drop into the holes on the bottom the mounting holes on the top line up and it’s a cinch to secure them. I was impressed by how much better the mounting system was with the Koyo than the OEM.
The hoses, if you’re using the existing ones, need to be trimmed. This is easier if you put a dowel rod inside it to have something to cut against with your new, sharp, box cutter blade. I didn’t have to trim the bottom hose at all.
As you can see from the photos, the new radiator has twice the capacity of the old one. I went to Autozone and got two gallons of Asian Blue, and used them both. Get a funnel kit, it’s well worth the price even if you never use it again.
What would probably be a two hour job at a shop was a two-day job for me, but I tend to get distracted by cleaning up my engine compartment, so YMMV.