If that doesn t solve the problem locate the drain line access point near your indoor air handler.
Blow out ac drain line.
Place a piece of tape over the switch so it isn t turned on while you are working.
Remove cleaning port cap.
Turn hvac system off.
If the unit has turned off due to a blockage you may need a bucket to collect the condensation resting in the drain pan.
Move the switch to the off setting.
For this to work well you need to make a tight connection between the hose and the line.
Once the drain line is clear use a funnel to slowly pour a gallon of white vinegar through the tube.
You can find the cut off switch for the ac unit in the main circuit breaker.
Method 1 for small blockages in the ac drain line.
Alternatively you can use an air compressor to blast air into the air handler s end of the drain tube in the hopes of blowing the clog out the other end.
How to unclog ac drain line.
If you can separate the cleanout from the ac or block the path of water back to the ac drain pan you can insert the cut off garden hose into the drain line as shown in this video and just gush.
Vacuuming will be more effective if you have a partner plug up the other end of the line.
Kill the power for the air conditioner where you will be blowing air through the drain line.
If the clog is severe start with method 2.
Then attach the suction hose of a wet vac to the line and try to suck the clog out.
You ll know your ac drain line is clogged if you see water pooling in the pan underneath the unit inside your home.
There are two methods to clean out your air conditioning drain line.
Regularly cleaning your drain line can help your equipment run more efficiently.