This. On my Prius, the cabin air intake is wide open to the crawling critters. The openings are covered by a plastic cowling to restrict rainwater, but everything else can get to the top of the cabin air filter. There is a whole diy for prius owners to install 1/4” screens to cover the air openings.Check the cabin air filter, they commonly get in Toyotas through the cabin air intake.
It’s likely something similar can be done for our trucks.
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