99 Silverado A/C condensation drain

[S10Fan]

99 Silverado 1500, recently repaired/serviced the A/C, 40 degree vent air for a couple weeks. No condensation is draining from the firewall drain tube, no water on the interior floor (rubber mat). I bent a 1/8" piece of round bar and ran it up into the drain tube, no apparent blockage. I have to think some water would come out of the drain after each use.

How far up into the tube should I be trying to clean out? Should I remove the tube and try cleaning again?

I'd rather get ahead of this before I have 100 degree days and a wet floor.

Thanks in advance!