The engine may be in need of a tune up.
The ac pump may be seized up.
get out of your car find it turn on your car and get out feel the pump if it vibrates it is working if not get a new one
turn the car on
If you have the defroster on, the ac comes on automatically.
You have a blocked radiator.
yes it does AC needs some power from engine so it happens....
the ac in the car cools, the fact you have set a higher temperature than the ambient tempereature means that the car's heater is working and so is the ac, if you wish to heat up your car, turn the ac off.
When you hit it, the triangle vibrates, and the air around it vibrates. The air particles closest to it vibrates, then the air particles next to the first ones start vibrating as well and so on, so it reaches your ear. From liam514 if u have any other questions tell me and i will answer them as best as i can.
if you are in a car turn on the ac or have a portable fan with you
The idle is set too low or there is an electrical problem
If its dropping RPM's when u turn ur AC on then u need to clean ur Mass Airflow Sensor which will be located on the intake. Use B12
when the AC is on it puts more stress on the engine cause the engine has to now turn the compressor. which in turn adds more heat to the engine.