Unanswered I have two coolant sensors side by side. Which is which? (picture)

scottinalaska

New Member
Jun 3, 2024
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Vehicle Drivetrain
2wd
Vehicle Year
2004
The 2004 starts up and runs great. But within 5 minutes, the temp gauge is pegged hot. The engine is still at 180 when I check it at the thermostat housing. The lower hose is still cool. I replaced the thermostat and the ECT. Yet still the same problem. The upper hose also gets tight as if it is fully warmed up. I see another smaller sensor adjacent but cannot find ANY wires nearby that go to it. Any ideas? Thanks. Scott
 

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    tundra coolant sensors.jpg
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