The cap which came on the Koyorad is probably a two way cap. If so it needs to be replaced with a Subaru one way cap.
Cons: wrong cap type, needs replacement
Vehicle:
Subaru
Reviews of KOYORAD radiator cap
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3 votes
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1 review
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What we know about KOYORAD radiator cap
The brand is registered in Japan. Official website: http://www.koyorad.co.jp/.
In March 2026, PartReview does not yet have a formed opinion of KOYORAD radiator cap. You can help by adding a review for KOYORAD radiator cap.
Currently there are 1 review and 3 votes. Average rating — 1 out of 5. Vote balance: 0 up, 3 down.
Users also evaluated the qualities of KOYORAD radiator cap:
- Seal - no coolant weeping around the cap neck - no rating yet
- Overheat control - engine temp remains normal on hot days - rated negatively. 1 point out of 5.
- Hose feel - upper hose feels firm but not rock hard when hot - no rating yet
Radiator cap KOYORAD in car-specific ratings
Unfortunately, there are no car-specific ratings for this part yet. You can help by adding a review and specifying your car.