Air is called a "non-condensible" in your A/C system. There is no easy way to tell. It will need evacuating and recharging if you think that is the problem. Generally, there will not be air in the system unless serviced by someone that does not know what they are doing. The refrigerant is under pressure at all times so air will not voluntarily enter the system.
You have a system performance test done on your AC system.
If your ac is making noises or is blowing hot air instead of cold
It might be overcharged. Or you might have contaminants in the system like air or acid.
A split system air conditioner is a central air conditioning system that is "split" into two components: the air conditioner that sits outside of your home and an indoor component to move the air through duct work, such as a furnace and coil. A window unit only cools the single room it is installed in. It does not move air through ducts like a split system does. It will be more expensive to run a window AC to cool a home, but the upfront cost will be less than a central AC system.
I have a York AC unit, model D1NA024N05606C. Can you tell me what year this is.
It usually means that your system has developed a leak. Your AC system is charged with freon gas. If a certain amount leaks out, a safety device prevents the AC compressor from starting. Without the compressor, no cold air.
The 1996 Nissan Maxima air conditioning system has a capacity of 5.4 pounds of Freon. A recharge kit will come with a gauge that will tell you when the system is full.
The easiest way to recharge your air conditioning system is with a recharge kit. The recharge kit will come with one pound of Freon, a gauge to tell you when the system is full, and instructions.
You use an AC Flush & Purge machine, if you don't have one of those then you disassemble the entire system and used compressed air with flush solvent to clean the system. NOTE: trying to flush the system with compressed air is not recommended as it is very ineffective.
The AC system doesn't use water. Water may be produced at the evaporator as a result of the rapid exchange of heat to the ambient air, but there is no water in an AC system.
What part of the AC system needs to be replaced?
The blower motor circulates the air through the system.