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OK. The noise you are hearing is the recirculation flap motor. It could be what is causing the condensation. Easy way to check in after the noise has stopped push the recirculation button on the AC controls to see if the noise happens. If the motor is bad and the flap isn't closing you could be getting moisture from the outside air. As far as the check engine light goes there is no relation. 2 completely different systems. The flap motor would probably run you a couple hundred of dollars. The check engine light could be anything.
Have the torque converter checked to make sure the bolts are not loose connecting it to the flywheel,and if it is in the engine(the knock)then remove the oil pan,and check for play in the rod bearings,if there is,the crankshaft would have to be resurfaced,or replaced along with new rod,and main bearings.
The noise your hearing is comming from an aluminum timeing chain guide on the drivers side of the timeing chain. My truck had the same problem. The noise first started when the engine was started and then within seconds went away. I drove it for about a year not knowing what the noise was comming from. A few weeks ago the noise got very loud and the truck stopped starting eventually. A few hours ago I pulled the front of the motor off to replace the timeing chain and my guid was broken right off and laying at the bottom of my oil pan. You can remove the two allen head bolts that hold this guide in place and run the vehicle without the guide. Problem solved and no more noise.
Don't know if this helps. Had squeel in belt area. Occasionally engine would stop when squeel got loud and sometimes engine would try to quit while going at various speeds. Found tensioner pulley was bad and changed it. Still squeeled and engine would stop when squeel got loud. This time while sitting in yard. Further checking found binding in power steering pump. Will be putting on new one tomorrow. Hope it works. Will update.