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Most likely the clutch on your ac compressor has stopped working or the entire compressor has seized. The blower will still work, but without the clutch working correctly int won't cool like it should. While possible to replace just the clutch on a compressor, it's generally better to replace the entire assembly.
Fuses blow because of higher than normal amperage in the circuit. Not sure what circuit the blown fuse is for but if it is for the fan the fan may be shorted therefore blowing the fuse. If you put fuse in while the ac was still on try shutting off the ac then putting the fuse in. See if it blows then if it doesn't then turn the ac on and if it blows you have at the very least isolated the system at fault.
CHECK THE PSI IN THE SYSTEM IF ITS READING MORE THAN 40 PSI OF 134A SOMEONE OVER CHARGED SYSTEM,(CAN BLOW COMPRESSOR) IF THE PSI IS WITHIN PARAMETERS PUT A NEW RELAY IN IF ITS A STANDERT 5 PROG 12V RELAY THE OEE# IS MOST LIKELY ER13 ONCE THE PSI AND RELAY HAVE BEEN CHECKED IF THE FUSE STILL POPS....ITS A SHORT WHICH IS A NIGHTMARE FOR ANY CLASS A MECHANIC....FIND A ELECTRICAL SKIMATIC AND CALL AN AMRATURE PRO....
sounds like a short some where, start by replacing fuse, leave a/c off, turn heat on, does it blow fuse? if yes then bad blower motor. if heat rruns then turn on a/c if that blows fuse then you might have bad a/c compressor . start there. hope this helps.
It looks like the wire circuit for the wiper motor is touching the car body when shaken so the only thing you can do is shake the wires and terminals yourself while engine is running then maybe you can pinpoint where the earthing is.