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First generation of Toyota's full-size SUV.

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Overheating when idle in traffic

Weather temperature is above 80 degrees and I am sitting in a drive thru for fast food. Temperature gauge climbs to the 3/4 mark but I can temporary cool when I turn on heat and outside intake vent is on. I do not have problems while car is moving.

My guess is the temperature fan switch is not activated.

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Sounds like a fan problem . Check the fan relay and fuse. You can also use a cheater to check the fan motor to see that the fan itself isn't the problem. Sometime this condition will show up when the coolant level is low or if the thermostat is sticking and only working occasionally. finally check the belt that runs the water pump . If the pump belt is slipping and the pump is not circulating coolant the temp will rise

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@jimfixer Appreciate your reply and wisdom here! Thx.

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It sounds like your cooling system is struggling at low speeds when there’s no airflow from driving. A few things to check:

  • Cooling fan – Ensure the fan activates when the engine reaches a high temperature. If it doesn’t, inspect the fan fuse, relay, and wiring.
  • Coolant level – Low coolant can cause overheating, especially at idle. Top it up if it’s low (after the engine is cool).
  • Thermostat – A sticking thermostat can sometimes work on the highway but fail to open fully at idle.
  • Water pump and belt – If the belt driving the water pump is loose or slipping, coolant circulation at idle will be weak.

Since it cools down when you turn on the heater, that points to a circulation or cooling fan issue. Start with the fan operation and coolant level, then move on to the thermostat and pump if needed.

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