Check the radiator cap. I had this same issue (though no overheating, perhaps because I was driving in sub-freezing temperatures) and after replacing the radiator cap with a $12 part, no issues since.
Reviews of OEM Subaru radiator cap
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3 votes
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1 review
Description
OEM Subaru
Japan
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What we know about OEM Subaru radiator cap
The brand is registered in Japan.
In March 2026, PartReview does not yet have a formed opinion of OEM Subaru radiator cap. You can help by adding a review for OEM Subaru radiator cap.
Currently there are 1 review and 3 votes. Average rating — 5 out of 5. Vote balance: 3 up, 0 down.
Users also evaluated the qualities of OEM Subaru radiator cap:
- Seal - no coolant weeping around the cap neck - rated positively. 5 points out of 5.
- Overheat control - engine temp remains normal on hot days - rated positively. 5 points out of 5.
- Hose feel - upper hose feels firm but not rock hard when hot - no rating yet
Radiator cap OEM Subaru in car-specific ratings
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