Cooling SystemQuestionCommunity Starter

2025 Honda Civic Sport Touring Hybrid — a/C is cold while driving, warm at stoplights

MileageBuilder65Community StarterMay 19, 20262025 Honda Civic Sport Touring HybridBay Area
A/C gets properly cold on the highway but becomes noticeably warmer at long lights. It cools down again almost immediately once the car is moving. Could this still be a refrigerant issue or does that point more toward airflow/fans? Any data points from owners would help.
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13 replies

TowTraveler19Community StarterCommunity StarterMay 19, 2026permalink
This is usually cheaper to test than to guess. Get a real battery/charging test on the 2025 Honda Civic, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. Write the result down so the next test isn't a repeat of the last one. Make the next action something you can finish this week. Not driving it hard until I know more.
CanyonFan50Community StarterCommunity StarterMay 19, 2026permalink
I hear you, though I'd still want a second check. Capture voltage while the 2025 Honda Civic is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. On “a/c is cold while driving, warm at,” that was the fork that mattered for me. The universe charges extra for guessing. This is me being the wet blanket on purpose.
ShiftBuilderCommunity StarterCommunity StarterMay 19, 2026permalink
This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2025 Honda Civic is losing coolant with no puddle. If the cheap test changes it, stop and reassess. Post the numbers (or the code) and people can get more specific. This is the version I'd tell a friend.
TowTraveler19Community StarterCommunity StarterMay 19, 2026permalink
I'd want a measurement, not a hunch. Write temp, speed, and in-gear vs coast when the 2025 Honda Civic does it — then decide on parts. If the cheap test changes it, stop and reassess. Time, temperature, and whether it's in gear are the notes that actually help a shop. Checking again after work.
TrackTech97Community StarterCommunity StarterMay 19, 2026permalink
Fair point. Counterpoint: Capture voltage while the 2025 Honda Civic is actually failing — after it restarts you've lost the clue. That's the branch I'd chase this week. This is from a 2025 Honda Civic in Bay Area. Happy to compare notes if your setup is different. This is the version I'd tell a friend.
PixelHauler42Community StarterCommunity StarterMay 19, 2026permalink
This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2025 Honda Civic is losing coolant with no puddle. Don't erase codes until someone who can help has seen them. Happy to compare notes if your setup is different. A day of patience here is cheaper than a wrong part. Checking again after work.
MileageCommuterCommunity StarterCommunity StarterMay 20, 2026permalink
If it were in my driveway, a pressure test beats staring at a dry driveway if the 2025 Honda Civic is losing coolant with no puddle. If the cheap test changes it, stop and reassess. Do that first. Not driving it hard until I know more.
TowTraveler19Community StarterCommunity StarterMay 20, 2026permalink
Ask what changed right before it started. Swap the cheap/easy piece first on the 2025 Honda Civic and see if the fault moves. Save the big job until that test fails. This is from a 2025 Honda Civic in Bay Area. Write the result down so the next test isn't a repeat of the last one. Parking it somewhere I can hear it better next time.
CanyonFan50Community StarterCommunity StarterMay 20, 2026permalink
Intermittent stuff lies if you only catch it once. Loaded-suspension checks on the 2025 Honda Civic catch play that a wheels-hanging inspection misses. That's the branch I'd chase this week. On “a/c is cold while driving, warm at,” that was the fork that mattered for me. Parts cannon is a personality type I try to avoid. Might be overthinking it, but I'd rather overthink than overspend.
MileageCommuterCommunity StarterCommunity StarterMay 20, 2026permalink
I wouldn't throw parts yet. Swap the cheap/easy piece first on the 2025 Honda Civic and see if the fault moves. That's the branch I'd chase this week. This is from a 2025 Honda Civic in Bay Area. That's the whole play. Not interested in a five-hour wait for a shrug.
CanyonFan50Community StarterCommunity StarterMay 20, 2026permalink
Intermittent stuff lies if you only catch it once. A pressure test beats staring at a dry driveway if the 2025 Honda Civic is losing coolant with no puddle. You'll know quickly if you're on the wrong tree. On “a/c is cold while driving, warm at,” that was the fork that mattered for me. This is from a 2025 Honda Civic in Bay Area. The universe charges extra for guessing. If your situation is the opposite, ignore me. Might be overthinking it, but I'd rather overthink than overspend.
TowTraveler19Community StarterCommunity StarterMay 22, 2026permalink
Same neighborhood, different next step: If a shop can't duplicate it on the 2025 Honda Civic, bring a video plus freeze-frame data, not just a story. If the cheap test changes it, stop and reassess. This is from a 2025 Honda Civic in Bay Area. Write the result down so the next test isn't a repeat of the last one. I'd rather look cautious in this thread than stuck later.
EVMiles31Community StarterCommunity StarterMay 20, 2026permalink
I'd want a measurement, not a hunch. Write temp, speed, and in-gear vs coast when the 2025 Honda Civic does it — then decide on parts. That's the branch I'd chase this week. Not gospel, but it saved me a headache. I'd rather be boring and correct. Only after sitting overnight so far.
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