Anyone else: Coolant level slowly drops with no puddle

It did coolant level slowly drops with no puddle twice this week, both times after sitting. No change in mileage feel. Might be overthinking it, but I'd rather overthink than overspend.

Intermittent stuff lies if you only catch it once. Move a coil or plug on the 2023 Mercedes-AMG C43 if it's cylinder-specific and see whether the code follows. Don't erase codes until someone who can help has seen them. On “coolant level slowly drops with no puddle,” that was the fork that mattered for me. Learned this the expensive way on a previous car. Climate here is different, so treat that as a local data point. I'd rather pay for diagnosis than a second guess-repair.

I wouldn't throw parts yet. A pressure test beats staring at a dry driveway if the 2023 Mercedes-AMG C43 is losing coolant with no puddle. You'll know quickly if you're on the wrong tree. Stop there until you know. Not driving it hard until I know more.

Start with the test that can prove you wrong. Write temp, speed, and in-gear vs coast when the 2023 Mercedes-AMG C43 does it — then decide on parts. You'll know quickly if you're on the wrong tree. This is from a 2023 Mercedes-AMG C43 in Atlanta with 8,200 miles. Happy to compare notes if your setup is different. That's my plan before I call anyone.

This is usually cheaper to test than to guess. Loaded-suspension checks on the 2023 Mercedes-AMG C43 catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. Just my two cents from doing this recently. Happens in gear, not in park, for what that's worth.

If it were in my driveway, get a real battery/charging test on the 2023 Mercedes-AMG C43, not just resting voltage, before blaming a module. You'll know quickly if you're on the wrong tree. Post the numbers (or the code) and people can get more specific. This is the version I'd tell a friend.