I just bought a Koyo, goes in tomorrow and appears to be great quality
Pros: great quality
Reviews of Koyo parts For Business
Average Rating
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The manufacturer's average rating is calculated based on ratings of all its spare parts. It determines the place in the manufacturer ranking
4.4
Manufacturer Ranking
#23
57
Spare Parts
1
Country
Japan
Website
koyo.eu
Spare Parts
Comparisons
Seems like a loose ground, my s13 did this when the grounds randomly came loose. That said my s13 cluster is so damn slow to react so I run an aftermarket gauge. I have a koyo rad which came with a slot for an aftermarket sensor.
Also i would hope it's not the case, however you mentioned this after an alternator change. I had a 96 civic with a turbo setup and I had an alternator with a failed voltage regulator, all of my aftermarket gauges and temp gauge was acting like this. I would check the volts from the alternator if this is the case, it also ballooned the hell out of my battery..
Pros: aftermarket gauge reliable, alternator voltage check
Cons: potential voltage regulator failure
Vehicle:
Honda Civic
Koyo Radiator A2807. Great brand and very affordable.
Pros: great brand, very affordable
Part number: A2807
My opinion koyo rad. But any with the heart symbol are favorites.
Pros: koyo rad favorite
It’s got an actual Koyo radiator which is a good sign.
Pros: good quality
Vehicle:
Nissan
My only recommendation after testing several different radiators is to go with Koyo.
Pros: best performance after testing
My '09 had the bad number, so I bought a Koyo radiator and spent an afternoon swapping it all. That was ~6-7 years ago.
Pros: easy to swap, long-lasting
Vehicle:
Nissan
Koyo radiator is the move, it’s all aluminum, no plastic to worry about, the drain plug is legit and there’s a port to add a coolant temp sensor if you want gauges. It has an extra row for better heat exchange and dissipation my only complaint is there’s no aftermarket specific dual cooling fan set up which I feel would do wonders for cooling the engine bay at idle .
Pros: all aluminum, better heat exchange, legit drain plug
Cons: no dual cooling fan setup
I just bought a koyo and it's a bit of a learning curve installing it. It took a few hours to burp the system of air but now I'm chasing small leaks. The OEM cap doesn't fit the radiator
Cons: small leaks, OEM cap doesn't fit, difficult installation
Vehicle:
Honda S2000
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.
Pros: cooling too well
Cons: overheating intermittently, lower hose cool
Vehicle:
Nissan
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