I followed a couple of threads about some Nissans & Toyotas that apparently have inherant design flaws that make them prone to overheating. After all the ususal suspects were ruled out the last resort was to install hood vents. My concern was that there was some sort of safety issue that required an air tight engine compartment ( in case of fire- the operator would be safer from burns, etc).

The problem with an air tight engine compartment is that if the engine isn't running, the engine compartment is not getting any air flow what so ever ( the engine gets it's hottest a few minutes after shut down due to no coolant flow) & if the unit does this cycle multiple times per shift, the engine can get so hot the cooling system can't keep up, there's not much reserve anymore with cooling systems.

On 2 trucks I have installed vents on the radiator cover between the counterweight & hood assy for just this reason. I just wanted to make sure I wasn't violating any safety protocols- Thanks for all your inputs