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Brian LewisAug 2, 2025
Why is my Navistar Truck showing a high restriction reading?
- MmcarterAug 2, 2025
A high restriction reading on your Navistar Truck might be due to several reasons. The outer element could be plugged, requiring replacement. If your truck has an inner element, it might also be plugged and need replacing. Check for any obstructions, damage, or incorrect installation in the inlet screens or ducts upstream from the restriction tap. In case of heavy snow or rain, a temporary high restriction might occur, which should disappear after drying. If the gauge locks up at the red zone, inspect the elements for damage, reset the gauge, and recheck the reading after reusing the element.
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