blocked ac drain line Home › Forums › Public Forums › Drainage & Sewerage › blocked ac drain line This topic has 1 reply, 2 voices, and was last updated 23 years, 2 months ago by SylvanLMP. Viewing 1 reply thread Author Posts 7 Sep 2001 at 3:56 am #279023 MasterPlumbersKeymaster How can I unclog my main AC drain line–the water is overflowing into the auxiliary pan—thanks!!! 7 Sep 2001 at 10:34 pm #299817 SylvanLMPParticipant quote: Originally posted by mikenev:How can I unclog my main AC drain line–the water is overflowing into the auxiliary pan—thanks!!! Normally the condensate line (drain) is too small for regular snaking. When I was an active stationary engineer we used Nitrogen BUT becareful with the pressure and wear eye protection. You can also use a RAM JET by General wire commpany GOOD LUCK Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In