Cover where the air shoots out of with lots of duct tape.
Try the "just vent" idea first - it's cheaper.
Hello all, again...
Just a little followup to the original query.
I think I'm going to go with Mr. Barker's idea. None of the other ideas,
including even the smoke, are bad ones, but I've had more than one person
"the real world" say that using a bug bomb (or bug spray) pointed at the
cowl with the fan on would probably drive the bugs out.
I'm not above shooting Ace Hardware wasp contact killer into the vents,
I worry about the toxic afteraffect on truck passengers!
I have no driver's side window at the moment as I slammed the door in an
angry rage and watched the window fall out of the bottom. I probably can't
use a bug bomb inside with much effect on the bugs.
I have only one problem. The truck is a Diesel and as such has a vacuum
booster or pump. I've been told that it lives where the carb would be on a
gasoline engine. Unfortunately, it's broken and as such (per my
understanding) the air flow dampers and routing stuff doesn't work unless
you rev the engine up to a very high idle speed. Air only shoots straight
out the heater outlet--where I haven't seen any wasps. That obviously puts
slight (excuse the bad pun) "damper" on the chances of success that this
Anyone got any ideas on that one? I don't see a way to rev the engine up
easily and without risk of getting entagled in drive belts from the engine
I'd put a brick on the gas (do you call it a gas pedal on a Diesel? :-) ),
set the vents and fan, and set off the bug bomb, but I probably don't have
chance to test various bricks and blocks to make sure they don't flat out
floor and therefore destroy the motor.