One of the exhausts pipes of the HVAC system in my garage appears to be leaking. There is a PVC pipe that comes out of the HVAC and is not connected to anything. It was just left as if it was a drain out pipe. Everyone once in a while it sort of drips water. Normally I figured it was due to condensation. A couple of days ago I noticed that there was a whole trail of water coming out of the pipe to the entrance of the garage (the HVAC sits at the very back of the garage). When I checked it, it had continuous water dripping from it. I put a bucket under it and kept an eye on it. The same day I had to empty the bucket twice (2 gallon bucket). Yesterday and today, there is just a bit of water at the bottom of the bucket so not much water coming out of the pipe. My neighbor had mentioned that he though the pipe was an auxiliary to the main pipe in the HVAC and that it should only drip water if there is something wrong on the main pipe (ie. clugged up). My questions are:
1. Is this pipe that is sticking really a 'backup' PVC pipe that should not really not be dripping regularly?
2. The HVAC system is about 6 years old, is this 'clugging' a common problem? what can cause it and how can I prevent it?
3. How serious can this be? and how much could it cost me?
4. is there anything I need to be aware of when the HVAC guys comes out to take a look at it so that they don't pull a fast one on me?