A/C drain line ?

[yellowstang]

So the condensation line from my A/C goes into the sink in my master bathroom, and I have noticed whenever the heat or A/C is on, I smell sewer gas. It's like the water in the trap is getting pushed back and the gas can escape past it. Yes the drain line is before the P trap, it is in the proper place.

I went up into the attic and the drain line has the open end for the vest, and I feel air blowing pretty hard out of it when the A/C is on. Is that normal? I realy don't think I noticed this smell until this past winter, lived here now almost 4 years.

I smelled the open end of the pipe, no odor at all, just in the bathrom when the stupid thing is working.

Any idea's/suggestions? I have to keep the sink drain closed, or the bathroom smells like ass!

Pic of the pipe in the attic that goes to the bathroom.

[junk racing]

it is normal to feel air coming from the drain line, and it sounds like you may need a p trap in the condensation line going too the sink, is this a gas furnace? if so the p trap goes before the t.

[yellowstang]

it is normal to feel air coming from the drain line, and it sounds like you may need a p trap in the condensation line going too the sink, is this a gas furnace? if so the p trap goes before the t.

yeah, the furnace is gas, but the P trap on the sink is after the condensation line, otherwise the gas would back up into the A/C drain line. Are you saying I need two P traps? Not much room between the line coming down the wall and the sink's drain line, like maybe 6 inches.

[yellowstang]

[junk racing]

no sir you just need one coming from the main drain line out of the furnace, i will get you a pic of what i mean, the one under your sink should stop the odor i would think...the trap in the drain line of the furnace aids in drainage.

[junk racing]

Your first pic up top the line on the left is your primary, put a running trap stRaight out of the coil into that tee if you have room, that will keep the air from blowing through the line.

This is a running trap

[yellowstang]

Your first pic up top the line on the left is your primary, put a running trap stRaight out of the coil into that tee if you have room, that will keep the air from blowing through the line.

This is a running trap

Sweet, Home Depot, here I come!

Thanks!