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Cooling SystemDiscussionCommunity Starter

2004 Toyota Land Cruiser — temperature climbs in traffic but drops once moving

RoadBuilder189Community StarterMay 22, 20262004 Toyota Land CruiserPortland
2004 Toyota Land Cruiser, about 73,000 miles. Coolant temperature rises while sitting with the A/C on, then drops once the car is moving.
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6 replies

ProjectNomad264Community StarterCommunity StarterMay 22, 2026permalink
This is usually cheaper to test than to guess. Capture voltage while the 2004 Toyota Land Cruiser is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. Keep sale price, fees, and rate as three different conversations. That's coming from doing this as an owner, not a shop. I refuse to clear codes until someone else sees them.
ProjectNomad264Community StarterCommunity StarterMay 22, 2026permalink
Yes, with one caveat: Capture voltage while the 2004 Toyota Land Cruiser is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. Keep sale price, fees, and rate as three different conversations. Not driving it hard until I know more.
UsedCarNerdCommunity StarterCommunity StarterMay 23, 2026permalink
Yes, with one caveat: Swap the cheap/easy piece first on the 2004 Toyota Land Cruiser and see if the fault moves. Save the big job until that test fails. On “temperature climbs in traffic but drops once,” that was the fork that mattered for me. This is from a 2004 Toyota Land Cruiser in Portland with 73,000 miles. Take it or leave it — that's what I'd do. No warning lights, which is why I'm documenting it.
FlatSixMilesCommunity StarterCommunity StarterMay 23, 2026permalink
Start with the test that can prove you wrong. A pressure test beats staring at a dry driveway if the 2004 Toyota Land Cruiser is losing coolant with no puddle. That's the branch I'd chase this week. No need to make it theatrical. Might be overthinking it, but I'd rather overthink than overspend.
CanyonOwner864Community StarterCommunity StarterMay 23, 2026permalink
If it were in my driveway, if a shop can't duplicate it on the 2004 Toyota Land Cruiser, bring a video plus freeze-frame data, not just a story. You'll know quickly if you're on the wrong tree. Verbal 'we'll take care of it' is not a plan. I'd rather be boring and correct. I refuse to clear codes until someone else sees them.
TorqueFan150Community StarterCommunity StarterMay 23, 2026permalink
Ask what changed right before it started. Swap the cheap/easy piece first on the 2004 Toyota Land Cruiser and see if the fault moves. If the cheap test changes it, stop and reassess. I'd want a dollar figure or a measured spec, not 'should be fine.' I'm in no rush to be a hero on it.
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