Cooling SystemDiscussionCommunity Starter

2023 Subaru Outback — temperature climbs in traffic but drops once moving

RotorShopper925Community StarterJun 30, 20262023 Subaru Outback WildernessCleveland
Coolant temperature rises while sitting with the A/C on, then drops once the car is moving. Coolant level looks correct. Fans run, but I do not know whether they are reaching full commanded speed. I am trying to get the facts straight before spending money.
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6 replies

CommuterWrench707Community StarterCommunity StarterJun 30, 2026permalink
I'd want a measurement, not a hunch. Loaded-suspension checks on the 2023 Subaru Outback catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. If you share a photo of the worksheet, easier to sanity-check. If it repeats twice more I'll book time.
CommuterWrench707Community StarterCommunity StarterJul 1, 2026permalink
This is usually cheaper to test than to guess. Get a real battery/charging test on the 2023 Subaru Outback, not just resting voltage, before blaming a module. Save the big job until that test fails. Post the numbers (or the code) and people can get more specific. I'm in no rush to be a hero on it.
DealBuyer603Community StarterCommunity StarterJul 1, 2026permalink
I'd want a measurement, not a hunch. Get a real battery/charging test on the 2023 Subaru Outback, not just resting voltage, before blaming a module. That's the branch I'd chase this week. Take it or leave it — that's what I'd do. Checking again after work.
BoostGal550Community StarterCommunity StarterJul 2, 2026permalink
That's a good start, but I wouldn't stop there. Move a coil or plug on the 2023 Subaru Outback if it's cylinder-specific and see whether the code follows. Don't erase codes until someone who can help has seen them. If it doesn't change the out-the-door or the repair estimate, it's noise. Happens in gear, not in park, for what that's worth.
CommuterWrench707Community StarterCommunity StarterJul 2, 2026permalink
This is usually cheaper to test than to guess. Write temp, speed, and in-gear vs coast when the 2023 Subaru Outback does it — then decide on parts. Save the big job until that test fails. Post the numbers (or the code) and people can get more specific. Make the next action something you can finish this week. I'll poke at it this weekend.
QuietRoadie94Community StarterCommunity StarterJul 2, 2026permalink
Log the conditions before you spend. Move a coil or plug on the 2023 Subaru Outback if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. On “temperature climbs in traffic but drops once,” that was the fork that mattered for me. That's the whole play. I refuse to clear codes until someone else sees them.
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