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Condensate drain

Condensate drain often abbreviated in HVAC as CD. It is air conditioner's drain line (or the condensate line). Condensate drain plays an important role in removing condensation produced by your air conditioner's evaporator coil.

Condensate line

The condensate line is an exit route for moisture collected by the AC's evaporator coil as air passes over it. Here's how it works:

  1. The coil removes humidity from the air and converts it into water
  2. The water drains into the condensate drain pan
  3. Enters the drain line
  4. Travels down the drain pipe and is deposited outside near the AC's outdoor unit

How to Clean Your Air Conditioner's Condensate Drain Line?

You will need these items to clean your AC condensate drain:

  • Rags
  • A wet/dry vacuum
  • Distilled vinegar
  • A funnel

Clearing Condensate Lines

  1. Turn off the power to your HVAC system (make sure you do it at the thermostat and at the breaker).
  2. Find the condensate pan, it is usually located directly under the unit. It may also be covered by a removable Access Panel.
  3. If you see standing water in the drain pan, your drain line is probably clogged. Use a handheld or shop vacuum to remove the moisture.
  4. Clogged drains can be cleared with suction. Do the job and check the vacuum canister to see if the clog was successfully removed.
  5. Find the access point on the drain line. Usually, the drain will have a T-shaped vent with a PVC cover. Remove the cover and inspect the drain. Use this port to flush the drain with distilled vinegar. Use hot water and a drop of dish liquid.
  6. Allow the solution to sit for 30 minutes.
  7. Complete the cleaning by flushing the pipe with water. Have a helper watch the pipe outside and tell you if the water is running freely.


If you're unable to clean your air conditioner’s drain line, make sure to call us!
We are local Air Conditioning company in Las Vegas, Nevada. Providing 24/7 professional HVAC Repair and Replacement Service.