The system is probably empty of freon. Running the pump manually without freon can damage the pump. The pump relies on the freon to carry the oil for lubrication.
It costs about $120 to pump down and recharge the freon in an A/C.
carefully
No.
You do not need to pump the system down just to clean the coil unless you are planning to remove the coil completely from the unit.
No
How much freon does a 5 ton heat pump hold?
yes it pumps freon
In order to buy freon you need a license, therefore you shouldn't attempt to add freon. Call a contractor to service your unit.
Pump up some freon.
If you are talking about removing the freon in the a/c system then you will need a freon reclaimer.............
Look for a small niple with a screw on head along the freon lines going to and from the air conditioning pump.