Just as a reference...

[Tungsten]

Small objects could fall in through the slats so Nissan issued revised cowl grilles for the truck.

 

Original cowl grille design:

 

 

Revised cowl grille design:

 

[sewebster]

So, what is the purpose of those grilles? My truck (91) is missing one entirely...

[GrimGreg]

Keep debris and leaves out of the interior ventilation system.

[Tungsten]

If enough debris falls into the ventilation system, the blower resistor that is inside the box will light it all up and you will have one smoking dashboard.

[sewebster]

Yeah, I should probably go fishing around in there and also visit the junkyard.

[MY1PATH]

cool, another potential use for those vents; I eventually pan to plumb one to my hidden snorkel. The hood hinge is in the way but I'll find a way arround that...

as for rain, I was conna make a small cowl for each vent.

[RedPath88]

So, what is the purpose of those grilles? My truck (91) is missing one entirely...

Keep debris and leaves out of the interior ventilation system.

If enough debris falls into the ventilation system, the blower resistor that is inside the box will light it all up and you will have one smoking dashboard.

 

The direction this topic is taking, naturally leads to this one:

 

How to: Prevent Fire (clean blower resistors)

[sewebster]

The direction this topic is taking, naturally leads to this one:

 

How to: Prevent Fire (clean blower resistors)

 

Awesome, thanks!