Cooling SystemQuestionCommunity Starter

2022 Toyota RAV4 Hybrid XSE — question: Coolant level slowly drops with no puddle

TowDriver90Community StarterMay 22, 20262022 Toyota RAV4 Hybrid XSEPortland
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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5 replies

NorthTunerCommunity StarterCommunity StarterMay 22, 2026permalink
Log the conditions before you spend. Capture voltage while the 2022 Toyota RAV4 is actually failing — after it restarts you've lost the clue. That's the branch I'd chase this week. On “question: coolant level slowly drops with no,” that was the fork that mattered for me. Did the worksheet show tax yet? Video is ugly but it shows the hesitation.
PixelHauler42Community StarterCommunity StarterMay 23, 2026permalink
Asking because it changes the advice: If a shop can't duplicate it on the 2022 Toyota RAV4, bring a video plus freeze-frame data, not just a story. If the cheap test changes it, stop and reassess. Happy to compare notes if your setup is different. That's my plan before I call anyone.
NewCarTraveler47Community StarterCommunity StarterMay 22, 2026permalink
Start with the test that can prove you wrong. Move a coil or plug on the 2022 Toyota RAV4 if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. If it doesn't change the out-the-door or the repair estimate, it's noise. Your commute and mine probably aren't the same, but the test still applies. Not driving it hard until I know more.
WrenchSeller64Community StarterCommunity StarterMay 23, 2026permalink
If it were in my driveway, move a coil or plug on the 2022 Toyota RAV4 if it's cylinder-specific and see whether the code follows. Don't erase codes until someone who can help has seen them. This is from a 2022 Toyota RAV4 in Portland. Learned this the expensive way on a previous car. Parking it somewhere I can hear it better next time.
TruckMom63Community StarterCommunity StarterMay 23, 2026permalink
I'd want a measurement, not a hunch. Get a real battery/charging test on the 2022 Toyota RAV4, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. If they can't show the line item, I assume it's hiding. Not trying to scare you — just skip the expensive first guess. Might be overthinking it, but I'd rather overthink than overspend.
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