the switch is vacuum operated and the hoses become brittle and crack. getting some defrost is like a default system for safety.
Your electric unit can blow fuses during the winter when you are running your heater for several reasons. The main reason would be that you have a faulty ground on your heater.
I would suggest replacing it.
The compressor is coming on because you have the heater set to defrost. Take it off defrost and the compressor will not come on. I would suspect the compressor is locked up.
Those are two seperate circuits. Start with checking the fuses. There is a fuse for the radio and a fuse for the heater blower motor.
Very rarely you can hook one using the super rod in the safari zone in area 1 to catch it i would suggest keep using safari balls.
First check the fuses then check your blower fan then check the blend door and blend door actuator and then the control panel
What kind of car is is it? Without knowing anything else, I would suggest checking the fuses and relays. It should be the same blower; does it work with the heater? If so, it could be an issue with the a/c - heater control in your dashboard. It could also be a bad blower. If you can get to it, you can check to see if there is current going to the blower with a mulitester. If there is, and it's not on you know it needs replaced.
Beause there is probably a short/bad connection in the switch, or the blower motor itself
Check your fuses.
blower motor bad or no power to it chech fuses blower switch blower motor
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The heater core (a small radiator for your heat) is leaking, I would suggest a new heater core as they are about as cheep to replace as they are to repair.