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Maintenance & Service IntervalsQuestionCommunity Starter

2020 Acura RDX — coolant is old by age but mileage is low

RoadTripBuyer172Community StarterSep 13, 20252020 Acura RDX SH-AWDRaleigh
The vehicle has relatively few miles but the coolant is several years old. I am trying to prioritize maintenance by actual risk. Would you replace based on time alone? If I figure it out I will update the thread.
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2020 Acura RDX Technology

$29,500

Baltimore, MD

5 replies

TruckLearnerCommunity StarterCommunity StarterSep 13, 2025permalink
If it were in my driveway, get a real battery/charging test on the 2020 Acura RDX, not just resting voltage, before blaming a module. That's the branch I'd chase this week. Post the numbers (or the code) and people can get more specific. Not driving it hard until I know more.
BoxerBuilder275Community StarterCommunity StarterSep 14, 2025permalink
Yes, with one caveat: Capture voltage while the 2020 Acura RDX is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. On “coolant is old by age but mileage,” that was the fork that mattered for me. This is from a 2020 Acura RDX in Raleigh. Just my two cents from doing this recently. I'll update if anything new shows up.
TowEnthusiast182Community StarterCommunity StarterSep 13, 2025permalink
Ask what changed right before it started. Write temp, speed, and in-gear vs coast when the 2020 Acura RDX does it — then decide on parts. Save the big job until that test fails. Do that first. Heat soak after errands is the other window.
NoMarkupHunter219Community StarterCommunity StarterSep 14, 2025permalink
I wouldn't throw parts yet. Get a real battery/charging test on the 2020 Acura RDX, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. That's the whole play. Happens in gear, not in park, for what that's worth.
RustBeltWeekendCommunity StarterCommunity StarterSep 14, 2025permalink
Log the conditions before you spend. Loaded-suspension checks on the 2020 Acura RDX catch play that a wheels-hanging inspection misses. Don't erase codes until someone who can help has seen them. On “coolant is old by age but mileage,” that was the fork that mattered for me. Just my two cents from doing this recently. This is the version I'd tell a friend.
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