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Alia do you have a second battery mounted on the right side? My observation is, there is a cooler, closer to ambient temp air flow, from the headlight area back along the right fender well. When the truck is stationary everything pretty much heat soaks to fan output temp, as the truck is driven faster this cooler airflow gets cooler and covers a larger area. Adding a battery to the right side would block some/most of this flow, it appears to come from the holes behind the headlight and some flows behind the side marker light into the fender cavity. I will bet that Toyota knew about this cooler flow (may have designed it?) and that’s why the air intake, injector resister, etc are mounted over there?
Insulation is most of the time good stuff, but in this case, with heat soak it may not be very effective. I would look at making some simple ducting to flow cooler air past the filter can, that approach maybe more effective?
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Kevin Patterson '96 LX450 '84 4x4 Mini '73 FJ40
Copper State Cruisers #007
"We have come to the conclusion that we can run our car over any road that a man can take a team of horses and a wagon, providing we can get traction." Dr. Horatio Nelson Jackson, 1903
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