Check your fuses, it might be shot
If it does not blow at all then that is a problem, but if it is when you first start it, the Caddy will not blow air on you until it is the selected temp.
it is drawing the hot air off the engine.
All air conditioners work by removing energy from one liquid and putting it in another liquid. Usually, the two liquids are the same. They blow air over the cold liquid which cools the room. They blow air over the hot liquid to the outside. With valves, air conditioners can be made to blow hot air inside and cold air outside. That is called reverse cycle.
why does ac blow warm air? why does ac blow warm air?
An air conditioner blows out heat
Possible blown fuse
When you have the heater on, does it just blow any air at all? or no air?
run a hot wire directly to the blower motor. see if it runs that way.
Tighten up your embouchure and Blow faster air.
if the heater does not blow out warm air change the setting.
If you are talking about the thermostat in your engine, the two have nothing to do with eachother. If there is no air at all coming out the vents, I suggest it is your blower motor.
Compressed air can blow out some of the particulates, but not all. Rather, a new filter is recommended. .