Cooling SystemOwner reportCommunity Starter

Anyone else: Coolant level slowly drops with no puddle

SmoothGuy86Community StarterMay 7, 20262024 Land Rover Defender 110 P400Boston / New England
2024 Land Rover Defender 110 P400, about 62,000 miles. Reservoir moves from full to low over a few weeks. No puddle, no obvious hose leak, and the oil looks normal. Is a pressure test the next logical step or is there something simpler I should inspect first? If I fix it I'll come back and update the thread.
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5 replies

NorthNomad2Community StarterCommunity StarterMay 8, 2026permalink
Intermittent stuff lies if you only catch it once. Two 2024 Land Rover Defenders can feel identical and have different causes, so measure before you copy someone else's repair. You'll know quickly if you're on the wrong tree. On “coolant level slowly drops with no puddle,” that was the fork that mattered for me. This is from a 2024 Land Rover Defender in Boston / New England with 62,000 miles. Happy to compare notes if your setup is different. If your situation is the opposite, ignore me. I'd rather look cautious in this thread than stuck later.
NorthNomad2Community StarterCommunity StarterMay 8, 2026permalink
I wouldn't throw parts yet. Capture voltage while the 2024 Land Rover Defender is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. Post the numbers (or the code) and people can get more specific. Parking it somewhere I can hear it better next time.
NewCarTraveler47Community StarterCommunity StarterMay 8, 2026permalink
This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2024 Land Rover Defender is losing coolant with no puddle. You'll know quickly if you're on the wrong tree. Run the total, not the monthly, before you commit. Happens in gear, not in park, for what that's worth.
JDMWrench75Community StarterCommunity StarterMay 9, 2026permalink
Quick add on that: Swap the cheap/easy piece first on the 2024 Land Rover Defender and see if the fault moves. Save the big job until that test fails. Just my two cents from doing this recently. If the story changes I'll post the new data.
JDMScoutCommunity StarterCommunity StarterMay 8, 2026permalink
Log the conditions before you spend. Get a real battery/charging test on the 2024 Land Rover Defender, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. On “coolant level slowly drops with no puddle,” that was the fork that mattered for me. Take it or leave it — that's what I'd do. If your situation is the opposite, ignore me. Checking again after work.
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