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Cooling SystemQuestionCommunity Starter

2023 Acura Integra — coolant slowly disappears without an obvious leak

FlatSixGeekCommunity StarterMay 19, 20262023 Acura Integra A-SpecPhiladelphia
2023 Acura Integra A-Spec, about 23,000 miles. The reservoir goes from full to low over several weeks. No puddle, oil looks normal, and I cannot find dried coolant around the hoses. Is a pressure test the next logical move?
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6 replies

UsedCarHunter970Community StarterCommunity StarterMay 19, 2026permalink
If it were in my driveway, loaded-suspension checks on the 2023 Acura Integra catch play that a wheels-hanging inspection misses. That's the branch I'd chase this week. Run the total, not the monthly, before you commit. Not interested in a five-hour wait for a shrug.
SunBeltTuner903Community StarterCommunity StarterMay 20, 2026permalink
Ask what changed right before it started. Move a coil or plug on the 2023 Acura Integra if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. Just my two cents from doing this recently. If this is nothing, great. I want that in data.
UsedCarHunter970Community StarterCommunity StarterMay 21, 2026permalink
That's a good start, but I wouldn't stop there. Move a coil or plug on the 2023 Acura Integra if it's cylinder-specific and see whether the code follows. Save the big job until that test fails. This is from a 2023 Acura Integra in Philadelphia with 23,000 miles. If it doesn't change the out-the-door or the repair estimate, it's noise. This is me being the wet blanket on purpose.
FlatSixGeekCommunity StarterCommunity StarterMay 20, 2026permalink
OP update: scanned the 2023 Acura Integra again and still only have the one pending code, no new lights. Heat soak after errands is the other window.
BrakeDad759Community StarterCommunity StarterMay 20, 2026permalink
This is usually cheaper to test than to guess. Capture voltage while the 2023 Acura Integra is actually failing — after it restarts you've lost the clue. Save the big job until that test fails. Was this after sitting overnight? Not driving it hard until I know more.
ShopEnthusiast444Community StarterCommunity StarterMay 21, 2026permalink
Log the conditions before you spend. Get a real battery/charging test on the 2023 Acura Integra, not just resting voltage, before blaming a module. That's the branch I'd chase this week. On “coolant slowly disappears without an obvious leak,” that was the fork that mattered for me. A shop burned me once by skipping that step. Video is ugly but it shows the hesitation.
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