The drain tube is plugged for the air conditioner condensate drain. Look under the hood on the passenger side of the firewall for a 4" long rubber hose hanging down with a 90 degree bend in it. Squeeze the end to open it up and let any debris flow out. If nothing comes out, squeeze the wire ring holding it onto the plastic spout, pull the hose off, then poke a pencil into the spout to dislodge any debris. You might have to find that hose by crawling under the car. It depends on how much room they gave you to work back there.
This video will help you fix it.
https://youtu.be/q9_MZiS2_NE
Please run down this guide and report back.
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Monday, August 24th, 2015 AT 4:45 PM