Yes, If vehicle overheats it may cause freon (refrigerant) to blow out
Yes, because it will cause your fan to not work at all therefore cause the overheating.
Obviously your engine should not overheat with simply turning on the AC so this would indicate that you are having problems with your cooling system. When the AC is turned on there becomes another drag on the engine due to the AC compressor being driven by the serpentine belt. I'd recommend checking your antifreeze level and looking to see if you have a leak from the radiator or a hose. Several other things to think about in relation to engine overheating are a stuck thermostat or possibly a plugged radiator. Engine overheating issues never go away and will probably get worse. Major engine damage can result if the engine is run hot for very long so I'd have this checked out at a reputable radiator shop as soon as possible.
Only when the AC is on or if the engine is overheating.
An engine usually has a higher idle speed when the ac is running. If the high speed idle does not operate then the ac will cause the engine to stall.
No. The drain tube just drains the condensation away from the ac evaporator coil.
Check the temp sensor. The control is not turning on the fan when engine temp requires it, so the most common cause is the sensor.
If the engine is overheating, running the ac will make it overheat faster. The ac only cools the inside of the car, it actually adds heat under the hood.
There are a number of things that could cause the overheating issue. If the overheating happens immediately, it's probably the water pump. If this happens only when it's hot, see if it happens only when the AC is on because then it could be the an auxiliary AC cooling fan that has gone bad.
Problem with ac drawing to much current.
Indirectly it does. Gasoline powers the engine which powers the AC. Without the engine running the AC doesn't work. Also on many cars the AC will cause the cars gas mileage to be lower if it is running at maximum AC.
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.
This is probably because of a relay disengaging the compressor clutch due to any one of several problems. Check to make sure you have the correct R134a charge in the system. Also check to make sure the radiator fans are running when the AC is on, and that your lines are not freezing up, particularly going to the evaporator. An overheating engine can also cause this problem.