Originally Posted by MuRCieLaGo
Had a radiator leak on my '84 Corvette last summer and I've tried radiator "leak-stop" product at my local auto parts store. I never thought it would work. Used 3 bottles ($3 each) and it worked perfect.
I think you should try this easy fix instead of running with a leak. I would be so scared running a FD with a rad leak...
NEVER use Stop Leak, or any kind of leak fix in a bottle. These products might work short term but will ultimately hurt you in the long run. If you ever have to take that part or the system apart, you will have severely gummed up/clogged internals that can void any warranty possible on replacement parts. This goes for coolant, oil, power steering, transmission, head gaskets repair, etc. None of this stuff is a good idea unless you simply do not care about the car in the long run.
Originally Posted by RENESISFD
Supposibly koyos do not fit well with the SMIC's even aftermarket ones.
I paid extra money for a fluidyne because it was supposed to drop right in, well it did not. I hand to bend the rad outlet tube for it to clear my stock fans. I was pissed because I paid the extra money specifically for the reason it was to supposed to fit right in.
OP, used is fine, just make sure it is being purchased from a reputable seller and check for leaks before install. It is not rocket science.
I had the same experience with my Fluidyne radiator. After I modified my fans to fit, the radiator ended up having severe internal damage (used). I just purchased a Koyo N-flo afterwards and it has been working hard for almost 5 years now. The fitment was spot on and has not given me any problems.
Originally Posted by Banzai-Racing
We have installed Koyos in nearly every car that has come into our shop for the last 10+ years. Absolutely great radiator, I have the Koyo N-flow cooling my 20B, without any issues.
+1 Great radiator
Originally Posted by Mrmatt3465
Koyo usually has Fitment issues. The best drop in replacement aluminum radiators are fluidyne or Ron Davis/mazdaspeed.
I've yet to see a Koyo fitment issue personally. They've all been bolt-in affairs. Have you personally had this issue? What usually causes a fitment issue?
Originally Posted by GoodfellaFD3S
Some shitty advice in this thread.
Do NOT use stop leak.
Do NOT buy a 20 year old used radiator.
Buy a Fluidyne, which will fit a stock car. New or lightly used. Do not buy a used Koyo.
I can agree with the first two points but would recommend a used Koyo just as much as I would a used Fluidyne. Just as Mahjik said below:
Originally Posted by Mahjik
Just like any other component of the car, it's not the component but the seller. There are several sellers on this forum that I would purchase a used radiator from... However, there are many more I wouldn't.
If you don't have a seller you can trust, then buy a new one.