The reason why is because there are to modes on your Air conditiniong, called fresh air mode and recycling mode, if you want to eliminate outside air put it on recycling mode. The answer to your question there are vents below your windshield to suck up fresh air mode and will pick up any smell outside for example cars exhaust fumes ETC.
Compressor not operating.
No, directly vents through to outside wall of building.
Most likely a cat settled over the hood vents and peed into the air con. Happens a lot when it's cold outside.
use mr. muscle
The flap that directs sir to the selected vents is jammed or broken...or the switch that controls it is.
Air vents on the outside wall of a house are typically placed to allow fresh air to enter and circulate inside the building. This helps to improve air quality, remove moisture, and prevent mold growth. Additionally, exterior vents are often located near appliances or equipment that require ventilation, such as HVAC systems or dryers.
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.
When you say "exhaust vents in your ceiling" I assume you are referriong to the heating and AC vents inside your house and not the roof vent on the outside used to vent the attic. It is most likely that the duct work was ran in the ceiling for ease of installtion or the house may be built on a slab and they did not want to run the duct work through the slab.
If it smells musty check the evaporator drain hose hose. Johnny Texas.
Depending on the year, make, model along with if it has single or dual a/c systems and what the outside temperature is, it can be between 36 to 48 degrees...... Simply, the A/C vents temperature should be whatever you set the thermostat as.
lava
The magma gushes out and then it flows every where. The volcano has vents that let air come out. When the vents open steam/ smoke comes out of those vents.