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2021 BMW X5 — temperature climbs in traffic but drops once moving

SleeperOwner672Community StarterMay 5, 20262021 BMW X5 xDrive40iDetroit
2021 BMW X5 xDrive40i, about 40,500 miles. 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 in Detroit.
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WeekendRoadie414Community StarterCommunity StarterMay 5, 2026permalink
Intermittent stuff lies if you only catch it once. Write temp, speed, and in-gear vs coast when the 2021 BMW X5 does it — then decide on parts. 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. Verbal 'we'll take care of it' is not a plan. Wrote this up on my lunch break.
HybridDetailer526Community StarterCommunity StarterMay 6, 2026permalink
This is usually cheaper to test than to guess. If a shop can't duplicate it on the 2021 BMW X5, bring a video plus freeze-frame data, not just a story. You'll know quickly if you're on the wrong tree. Stop there until you know. A day of patience here is cheaper than a wrong part. Checking again after work.
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