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Check for the drain hose or pipe in your unit so that it is not clogged. Through the ac process water is collected and thus needs to come out. If the drain is clogged water will be trapped and the blower will pick it up and send it through the vents.
Compressor not operating.
The thermostat tells the air conditioner to pull in air. The air then goes through cooling lines in to the house. goes through the vents and out through the registers in the rooms of the house.
The air is probably too cold causing condensation at the vents. try increasing the air flow which will warm it a few degrees.
Most certainly
The heater may not be on - but the fan still blows air through the vents when they're open !
The heater blower may not be working properly. Without the heater blower working, the air will not come through the vents.
Routine air vent cleaning saves homeowners money by improving the flow of air through the vent. When vents get clogged, the air has a harder time pushing through the vents, which causes energy bills to rise.
Most likely you damper is not opening or your fan motor is not running Check the fan motor if is running also look for vacuum line leak this may affect the damper
Yes, gnats can come out of dirty air vents. Gnats can actually come from anywhere. They are very pesky creatures.
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.
The steam could be coolant from a bad heater core.
This is caused by a faulty heater core that has corroded and now has a leak. It needs to be replaced.
When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
Check for a vacuum leak -sounds like it is starving for vacuum and reverts to the default position
heater fan broken.
Does air come out at defrost vents? Defrost is the default position. Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch