This is excellent, and unfortunately, realistic advice. No one at in any official capacity at Volvo is likely to admit to having recognized this fault.

However, I do not completely agree with your remedy.

The shape of the original duct, and the way it is cut (tapered from front to back; longer in the front) will be immediately recognized by anyone familiar with aircraft as a simple aspirator. I know I called it an "intake" in my earlier post, but that was so not to inject a new variable into the discussion. I now realize that choice of term was a mistake. While some Volvo design practices may be questionable, I cannot believe they would draw cooling air for the ECU at a point only a few inches from the ground. Hardly a dust-free source. I think this is a "draft tube", used in conjunction with the intake at the radiator shroud, to improve the circulation of air within the ECU enclosure at road speeds (in other words, no pun intended, it sucks air out). Cutting the orifice with a hacksaw as you suggest, will likely reduce aspiirator effectiveness, leading to less air flow over the ECU. My modification retains the original shape, but relocates it forward and introduces a flexible element to absorb upward motion. The original rigid duct only has to move 3/4" before coming into contact with the belt, and the point of contact is only a few inches from the lower end. Additional retainers will not prevent this relatively slight displacement when striking an unyielding surface (like a concrete parking curb or high manhole cover).