Stubborn condensate drain 97 F350
 

condensation drips from the bottom seam of the evaporator box and never reaches the drain hose. I used a small rubber tubing to push up into the drain hole and it goes in quit a distance. But still no draining. I removed the blower motor to see what could be there and it was pretty clean. Vacuumed what was on the coils there and a few tiny leaves was it. Tried using a shop vac on the drain hose but nothing came out. Tried sending water back up the drain line and it came out the bottom of heater core box inside first. did that a few times with the shop vac right after to see if the water would dislodge it an vac it out, no luck. Tried air hose on what coils I could, have not tried to blow air in drain hose didn't think it would be to effective.

Which is the most effective of the 2 to find such a clog..I need roto rootter.........

1.going in from the heater core side (looks like some serious dismantling to get to it)

2.removing the engine side evaporator box?



Any other thoughts would be appreciated
TIA

Compressed air.

Seriously? WOW how many air cans would it take to fill the box?







My thought against blowing air (air compressor)in the reverse direction is that it may lodge it up further in the system, if it does anything at all, because I can feel air being pushed out the drain tube which I didn't at first.

Shop air and something like this:

http://www.harborfreight.com/media/c.../image_339.jpg