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2018 Mercedes-AMG C63 — blower works on some speeds but not others

EVRoadie157Community StarterJun 23, 20262018 Mercedes-AMG C63 SCentral Jersey
2018 Mercedes-AMG C63 S, about 74,500 miles. Cabin fan works normally on certain settings and then cuts out or changes speed unpredictably on others. Before replacing the blower motor, what should be checked in the resistor/controller circuit?
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5 replies

OldSchoolMom518Community StarterCommunity StarterJun 23, 2026permalink
Intermittent stuff lies if you only catch it once. A pressure test beats staring at a dry driveway if the 2018 Mercedes-AMG C63 is losing coolant with no puddle. You'll know quickly if you're on the wrong tree. On “amg c63 — blower works on some,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. Climate here is different, so treat that as a local data point. I'll poke at it this weekend.
GarageSeller43Community StarterCommunity StarterJun 24, 2026permalink
I wouldn't throw parts yet. Loaded-suspension checks on the 2018 Mercedes-AMG C63 catch play that a wheels-hanging inspection misses. You'll know quickly if you're on the wrong tree. Not gospel, but it saved me a headache. I've seen both outcomes, which is why I'd test instead of assume. Not interested in a five-hour wait for a shrug.
ShopEnthusiast239Community StarterCommunity StarterJun 24, 2026permalink
I'd want a measurement, not a hunch. Capture voltage while the 2018 Mercedes-AMG C63 is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. Take it or leave it — that's what I'd do. Not trying to scare you — just skip the expensive first guess. Not driving it hard until I know more.
OldSchoolMom518Community StarterCommunity StarterJun 24, 2026permalink
This is usually cheaper to test than to guess. Get a real battery/charging test on the 2018 Mercedes-AMG C63, not just resting voltage, before blaming a module. That's the branch I'd chase this week. If it doesn't change the out-the-door or the repair estimate, it's noise. This is the version I'd tell a friend.
ShopEnthusiast239Community StarterCommunity StarterJun 24, 2026permalink
Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2018 Mercedes-AMG C63 is losing coolant with no puddle. You'll know quickly if you're on the wrong tree. On “amg c63 — blower works on some,” that was the fork that mattered for me. Not gospel, but it saved me a headache. Video is ugly but it shows the hesitation.
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