Engine radiator Koyo or Denso

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Denso Engine radiator

Put a few more $ in and buy a slightly more expensive one. Preferably from a bigger brand - Denso, Koyo etc. guaranteed to be better quality in most cases and fit better.

Pros: better quality, better fit
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Koyo Engine radiator
obdriver6
Rating 4.5
  • Overheating:
  • Leaks:

I would recommend a full aluminum koyo radiator. There are pricy but they fit like OEM and use the OEM fans. 2 years later with 15k and no issues.

Pros: fit like OEM, no issues
Cons: pricy
Mileage: 15000 km
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Koyo Engine radiator
SchrodingersLunchbox
Rating 0.5
  • Overheating:
  • Leaks:

Roughly 12 months ago, I upgraded the radiator on my 2000 Series 8 (~65,000km/40,000mi) to a Koyo R1443N 48mm N-Flow. The coolant seals blew because the radiator's design allowed air to accumulate, creating hot-spots and leading to seal failure. My water temps never exceeded 90C. After a rebuild, a valve was installed on the radiator elbow, making it quicker to bleed the system, and water temps are now around 77C, about 10C cooler than before. The Koyo radiator's design prevented proper bleeding of the coolant system, causing seal failure.

Cons: design flaw, air accumulation, seal failure
Vehicle: Mazda
Mileage: 65000 km
Part number: R1443N
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