Engine radiator VALEO or Koyo

Koyo Engine radiator
1testaccount1
  • Overheating:
  • Leaks:
Rating 4.5

I looked at what I bought like 165k and it was KOYO Radiator A1998 for $175 and I'm like 100k miles later and it still looks good. I just wanna change it for preventative maintenance since I'm gonna have my mechanic add the external cooler

Pros: still looks good, long lasting
Mileage: 160934 km
Part number: A1998
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Koyo Engine radiator

I run a Koyo 37mm radiator... and I will hit 200+F under hard driving. Under normal driving, my coolant temps are in between 178-185F.

Pros: good normal driving temps
Cons: high temps under hard driving
Vehicle: Mazda
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Koyo Engine radiator
evileagle
  • Overheating:
Rating 5.0

Koyo N flow. Only rad you’ll ever need. Even though you want to keep it “stock” the OEM style plastic crimped end tank design is a time bomb and should be avoided.

Pros: reliable, durable
Vehicle: Mazda
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Koyo Engine radiator
amg-rx7
  • Overheating:
Rating 4.5

Koyo is definitely one of the best available as a stock replacement. They make 2. The n flow is a little harder to fit but is “better”.

Pros: best replacement, better performance
Cons: harder to fit
Vehicle: Mazda
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Koyo Engine radiator
driveinvest21
  • Overheating:
Rating 4.5

I have a koyo radiator in my na6 with stock fan on it and it has no clearance issues. Probably wasn’t necessary for me currently but I’m going turbo after I spend more time driving it na so figured why buy twice and just went for the koyo.

Pros: no clearance issues, good for upgrades
Vehicle: Mazda
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Koyo Engine radiator

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.

Cons: tight hose connection, poor fitment
Vehicle: Nissan
Part number: RH020539N
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