How do I check if the plastic tube that comes out of the water pump of my furnace/AC does not leak?
I was reading this webpage http://inspectapedia.com/aircond/Condensate_Drain_Problems.php and I came across a comment that inspired me a method to check if my tube is OK. That would be to use a smoke bomb (search this keyword on that page) in a shop vac and to pump the smoke through the tube to see where it connects. This will work assuming that at the other end the tube is connected to a drain in one of the ways described here: http://inspectapedia.com/aircond/1633s.jpg If that is the case then the smoke will come out at the other end in the kitchen or bathroom and with that we located the other end of the tube. Having that location then we can easily conduct a pression test as suggested in one of the comments above