How to flush a clogged drain line? My air conditioning is liking from the vaults?
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- So the primary drain line for your A/C condesation drain line is clogged? If so the best way to unclog it is to go up in the attic and cut the drain line near the evap coil. You will then need to blow compressed air into the line this will unclog the line. You will need to reattach the line which is most likely a 3/4" PVC.
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