Cooling SystemQuestionCommunity Starter

2025 Hyundai Tucson Hybrid Limited — question: Runs hotter sitting in traffic than moving

PistonDad44Community StarterMay 13, 20262025 Hyundai Tucson Hybrid LimitedOrange County
2025 Hyundai Tucson Hybrid Limited, about 151,000 miles. Coolant temp climbs while idling with the A/C on, then drops back down once I'm moving. Coolant is full and I don't see a leak. Fans do run, but I'm not sure they're moving enough air. What would you test next? Appreciate any ideas on what to check first.
permalink

Related listings

11 replies

PistonDad44Community StarterCommunity StarterMay 13, 2026permalink
It did question: runs hotter sitting in traffic than twice this week, both times after sitting. No change in mileage feel. I'd rather look cautious in this thread than stuck later.
RoadHauler32Community StarterCommunity StarterMay 13, 2026permalink
Intermittent stuff lies if you only catch it once. Two 2025 Hyundai Tucsons can feel identical and have different causes, so measure before you copy someone else's repair. You'll know quickly if you're on the wrong tree. On “question: runs hotter sitting in traffic than,” that was the fork that mattered for me. Post the numbers (or the code) and people can get more specific. Parking it somewhere I can hear it better next time.
TireDad23Community StarterCommunity StarterMay 14, 2026permalink
I'd want a measurement, not a hunch. Move a coil or plug on the 2025 Hyundai Tucson if it's cylinder-specific and see whether the code follows. Save the big job until that test fails. Post the numbers (or the code) and people can get more specific. Wrote this up on my lunch break.
QuietBuilder89Community StarterCommunity StarterMay 14, 2026permalink
This is usually cheaper to test than to guess. Loaded-suspension checks on the 2025 Hyundai Tucson catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. Stop there until you know. A day of patience here is cheaper than a wrong part. I keep a notes app thread for this now.
OldSchoolDetailer28Community StarterCommunity StarterMay 14, 2026permalink
Fair point. Counterpoint: Capture voltage while the 2025 Hyundai Tucson is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. Take it or leave it — that's what I'd do. I'd rather pay for diagnosis than a second guess-repair.
BatteryWrenchCommunity StarterCommunity StarterMay 14, 2026permalink
Log the conditions before you spend. Swap the cheap/easy piece first on the 2025 Hyundai Tucson and see if the fault moves. That's the branch I'd chase this week. On “question: runs hotter sitting in traffic than,” that was the fork that mattered for me. Parts cannon is a personality type I try to avoid. This is the filter I use when the thread starts repeating itself. I refuse to clear codes until someone else sees them.
CruiseOwner79Community StarterCommunity StarterMay 14, 2026permalink
Log the conditions before you spend. Swap the cheap/easy piece first on the 2025 Hyundai Tucson and see if the fault moves. Save the big job until that test fails. On “question: runs hotter sitting in traffic than,” that was the fork that mattered for me. This is from a 2025 Hyundai Tucson in Orange County with 151,000 miles. Parts cannon is a personality type I try to avoid. If that fails I'll eat the diagnostic fee.
PistonShopper69Community StarterCommunity StarterMay 14, 2026permalink
Start with the test that can prove you wrong. Two 2025 Hyundai Tucsons can feel identical and have different causes, so measure before you copy someone else's repair. You'll know quickly if you're on the wrong tree. Run the total, not the monthly, before you commit. Cold start is when I can actually reproduce it.
SmoothMom48Community StarterCommunity StarterMay 14, 2026permalink
Start with the test that can prove you wrong. Swap the cheap/easy piece first on the 2025 Hyundai Tucson and see if the fault moves. If the cheap test changes it, stop and reassess. Did the worksheet show tax yet? Doing the boring step first on purpose.
SmoothMom48Community StarterCommunity StarterMay 15, 2026permalink
If it were in my driveway, two 2025 Hyundai Tucsons can feel identical and have different causes, so measure before you copy someone else's repair. Don't erase codes until someone who can help has seen them. When does it actually happen? Trying not to diagnose from the couch.
RoadPilotCommunity StarterCommunity StarterMay 15, 2026permalink
If it were in my driveway, if a shop can't duplicate it on the 2025 Hyundai Tucson, bring a video plus freeze-frame data, not just a story. Don't erase codes until someone who can help has seen them. This is from a 2025 Hyundai Tucson in Orange County with 151,000 miles. Had a similar mess a couple years ago and that's what finally sorted it. Trying not to diagnose from the couch.
Sign in to reply

Similar discussions