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m00t

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  • Lexus Model
    LS400

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  1. Okay, update. Thermostat changed, sensor changed, coolant reservoir changed. We are thinking that there's something wrong with the needle. concur?
  2. I'm sorry, I'm not familiar with vehicle part jargon- a 'sender unit'?
  3. We washed the radiator; nothing. A note on the temperature rise- it happens right from the starting of the engine. It steadily moves to that point when idle and in park, and quickly, when moving, of course. It remains there, even when driving relatively long distances.
  4. Our LS400 had been sitting in the front of our house for a while without use, so we decided to dust it off and make sure it was good to go just in case. Everything was fine... except that the temperature needle went above the standard 'middle mark'. It went up one full tick mark, in that it stopped halfway between the tick before the RED tick and above the tick above the middle mark. When running 'normally' it stays at that position, with no signs of going any further. We thought it was something cloggin' up the coolant pipes inside. We washed it out with cleaner fluids and still, no change. We changed the sensor. No change. We checked the radiator to find that yellowjackets had built mud nests onto the radiator. We cleared them out and vacuumed a bunch of grass and dirt at the bottom. No progress. What seems to be the problem? Is it a peripheral problem or an internal problem with the engine itself?
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