Engine radiator OEM Volkswagen or KOYORAD

KOYORAD Engine radiator
PatrickGSR94
  • Overheating:
Rating 5.0

I run the Koyorad 38mm radiator on my NB, with just regular Prestone green concentrate and distilled water 50/50, and OEM Mazda cap and thermostat. Coolant temps stay in the 190's at all times. It very rarely gets above 200 except on the hottest summer days, usually when sitting in traffic.

Pros: stable coolant temperatures, rarely overheats
Vehicle: Mazda
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KOYORAD Engine radiator
RyanGout
  • Overheating:
Rating 4.5

I placed the thicker koyorad in there and fixed a lot of issues, together with hood vents helped me getting my drift car cool.

Pros: fixed cooling issues, kept car cool
Vehicle: Mazda
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OEM Volkswagen Engine radiator
esmvdub1
  • Overheating:
Rating 5.0

I used a like new radiator I had from my 16v post going aluminum rad and fans on that car. so new fan, cleaned up the wiring and put a better looking relay in and tested it.

Pros: new fan
Vehicle: Volkswagen
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KOYORAD Engine radiator
OptionXIII
  • Overheating:
Rating 5.0

I have the koyorad myself, bought it used. Spend some time sealing the nose to force all air through the radiator and you'll never have an overheating issue naturally aspirated.

Pros: no overheating issue
Vehicle: Mazda
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OEM Volkswagen Engine radiator

The radiator on my 2016 is leaking, although leak isn't really the right word. Maybe porous. The hole is so small, it takes months to show a change in the coolant reservoir. On some days, given proper conditions, a small wisp of steam is visible coming from the radiator area. I added a UV dye to the cooling system, and it is visible then.

Pros: UV dye makes visible
Cons: small hole, porous
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