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I don't have a specific answer for your truck, but most most OBDII cars have intake air temperature sensors. I can read it on my ScanGauge. I've blocked off the outside vents to my air intake, sort of a warm air intake. I've seen temps as high as 140 degrees on the hottest days. If anything it helps my fuel economy, especially lean burn and warm up times. My advice would be to have a way to monitor the temperature. Intake air temp is one way to do it if you have a scangauge or ultragauge (although it may not be as accurate if your intake sources air from outside the engine bay). A cheap remote thermometer is another option. You could monitor the temps for a few days under a few different conditions to make sure it stays within acceptable limits. As far as those limits go, you are probably safe up to 150 degrees, maybe more. Most critical heat sensitive components are protected with insulation, and temps shouldn't effect them unless they come in direct contact with something hot.
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