Cooling SystemDiscussionCommunity Starter

2025 Lexus NX 350h — anyone else: Coolant level slowly drops with no puddle

RoadMiles27Community StarterJul 27, 20262025 Lexus NX 350hBay Area
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? Trying to diagnose before I book a shop.
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2 replies

TurboBuilder93Community StarterCommunity StarterJul 27, 2026permalink
Start with the test that can prove you wrong. Swap the cheap/easy piece first on the 2025 Lexus NX and see if the fault moves. Save the big job until that test fails. A shop burned me once by skipping that step. I'm in no rush to be a hero on it.
PixelDriver28Community StarterCommunity StarterJul 28, 2026permalink
I'd want a measurement, not a hunch. Capture voltage while the 2025 Lexus NX is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. This is from a 2025 Lexus NX in Bay Area. Monthly payment math is how wallets disappear. I'd rather look cautious in this thread than stuck later.
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