Definitely try a new Radiator cap. Mishimoto can be hit or miss for quality and also possibly not rated to match the pressures of the OEM cap.
Cons: hit or miss quality
Reviews of MISHIMOTO radiator cap
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7 votes
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Description
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I had a mishimoto rad cap that completely screwed up my coolant system.
Cons: screwed up coolant system
Vehicle:
Subaru Forester
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What we know about MISHIMOTO radiator cap
The brand is registered in USA. Official website: https://www.mishimoto.eu.
In March 2026, PartReview does not yet have a formed opinion of MISHIMOTO radiator cap. You can help by adding a review for MISHIMOTO radiator cap.
Currently there are 2 reviews and 7 votes. Average rating — 2 out of 5. Vote balance: 2 up, 5 down.
Users also evaluated the qualities of MISHIMOTO radiator cap:
- Seal - no coolant weeping around the cap neck - rated negatively. 1.7 point out of 5.
- Overheat control - engine temp remains normal on hot days - rated ambivalently. 3 points out of 5.
- Hose feel - upper hose feels firm but not rock hard when hot - no rating yet
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