Unplug clogged evaporator drain plug.
Buy a new one :)...x<3
It is most likely from mold in and/or under your upholstery.
Even when your vents are closed, air still is being pulled into the car. The musty smell means you inside cabin air filter needs to be changed. You can gain access to the filter through your glove box.
Is it a musty smell? What that smell is, is condensation that has built up in the heater box evaporator, then you turn on the heat or a/c and it smells musty. the dealer can peformed a ultra sonic cleaning of the evap for you to help with the smell. A good way to help this issues is to use higher blower speed settings, and also to use the 'REST' function when you leave the car, this leaves the blower motor on at a slow speed and can help eliminate the moisture build up. Hope that helps
It could have a blown gasket which causes that smell. And there could be something loose in the interior of the air conditioner.
no
Bad smells in the aircon is usually caused by bacteria. You can buy special air con sprays that kill off moulds and bacterias making the car smell nice again.
Most likely a clogged drain that drains A/C evaporator condensation.
how do you know if the air conditioner in your car works in the winter
An air conditioner in a car uses quite a bit of power. It is not unusual for a car to hesitate when the AC comes on.
Yes, but it's not an effective means of ventilation if you're trying to avoid the smell from remaining.
You will use more gas when your air conditioner is running.