Use compressed air.
pvc flue pipe and has a condensate drain
condensate,bleed line of all condensate
It is generally (pretty much always) a no no to run a furnace condensate line to the outdoors, there is no avoiding this freezing up and stopping your furnace short of wrapping it with electric heat tape, which would be a bandaid at best and no more cheaper than correcting it. If the furnace is running condensate outside, I have to assume there is no drain near by. The best solution is to install a condensate pump, which the furnace and AC can drain into, and it then pumps to a different location indoors, like a laundry stack, or if you must, tap into a drain pipe with the proper fittings. If this is above your skill level, it would not be a bank buster to call a good contractor and have done. The pumps are about $60 in my area, and you can figure 1/2 hr to 3/4 hour to install by a contractor.
Head to the roof, and check your vent line cover. It's basically a tiny roof for your furnace vent. You likely have a leak allowing water to fall down to the furnace. I would recommend being proactive about this: even though you have a drain leg, it can still allow moisture to get into your heat exchanger, which will mean a new furnace in a few years. Not to be an alarmist, but I'd take care of it soon.
condensate in the steam piping, probably due to improper slope of piping to allow condensate flow out.
Condensate forms on the AC coil as the AC runs for a while. AC units are supposed to have a condensate tube that's designed to drain the water. If the tube is plugged or otherwise damaged the condensate will back up and get into the furnace. To avoid damage you should make sure the condensate is draining properly.
Have you checked your drain to make sure it is not plugged?
First, make sure that it is the overflow. AC units have a condensation line. This is a necessary option as cooling the air causes condensation, much like a cold glass of water will condensate on the outside of the glass. The condensate line should be draining to a safe place, and draining whenever the unit is running. The unit should also have a secondary condensate line (overflow). this line should be separate from the main condensate line and be draining to a conspicuous place. If this line is draining, then you should check to see if the primary drain line is plugged. Anything from lint and dust to dead rats and mice have been pulled out of condensate drain lines. If you do not know how to get to this, call a professional and use the primary and secondary condensate verbiage to let him know that you are not an ignorant putz that he can take advantage of. That should save you a few dollars on the bill. Hope this helps. Terry
Lennox top o the line furnace is 98.2 percent efficient
there is no 1983 Ford Taurus.....they arrived in 1986.
Naphtha is a petroleum condensate, therefore it is a condensate, therefore they are both condensate.