I know this will sound odd check Ign. switch I couldn't remove keys and had switch repaired and it started working again. go figure?
Yes, gnats can come out of dirty air vents. Gnats can actually come from anywhere. They are very pesky creatures.
The heater core has failed.
a person satnding in the way of the vents
heater fan broken.
The heater may not be on - but the fan still blows air through the vents when they're open !
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
something has to be blocking the vents.
leaking ducts allowing air into system.
Heat and steam coming from the dash and air vents after replacing the water pump means that a hose is hooked up backwards in the new installation. The heater is actually taking on water when it is supposed to only take on hot air.
Return air vents.........
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
The most common cause of an air conditioner not blowing air is a plugged filter. Be sure your filter is clean.