Depending on what. Mostly is a sewage
They gurgle because of the sudden release of air. You have this gurgle because your vent pipes are either stopped up, in the wrong place, or are iadequate in size. When you drain water the you put pressure on the air in the drain lines. This pressure is actually sewage gas and should go out through your vent stack(s). You will need to repair or reppace your vents for this problem to be corrected.
The air is probably too cold causing condensation at the vents. try increasing the air flow which will warm it a few degrees.
Yes you can
Does not matter. Air will displace naturally when pushed into a room from the vent. Vents and ducting are laid out according to the plans of the unit. That is the only reason for top vents and bottom vents. If you are speaking of the intakes, the same principal applies.
because vents bring in things you need like air and bring out things you don't really need like water.
Return air vents.........
There are a number of reasons why air coming up from air vents would smell like dead fish. The air ducts may need cleaning. The air coil may need replacing. It could even be an electrical problem with the unit.
you may need to check your vents and see if they need cleaned or... you may need a new filter. you may need to check your vents and see if they need cleaned or... you may need a new filter. you may need to check your vents and see if they need cleaned or... you may need a new filter. COZ IT MIGHT BE AN AIR-CON!
You need to pay attention to whether or not the air vents for the CPU cooling system, or any other air vents, are blocked. Failure to do this could result in overheat damage to the system.
I'm not sure what vents you are talking about, but usually air vents are known to be working if there is air flowing through them.
Your heater core is leaking, Need to REPLACE HEATER CORE.
the middle vents only supply air from the ac unit using a separate in dash fan. the floor and defrost vents come only from the heater
you need to replace the vacuum.
Cold air return vents are the ones on the wall
If the air vents of the Chevy trailblazer 2004 are not blowing air, have the fuel pump checked.
Depending on what. Mostly is a sewage