MY 86 300E BLOWS A FUSE "7" WHENEVER I TURN ON MY AC. EVERYTHING WORKS UNTIL THE FUSE IS BLOWN. IT BLOWS COLD AIR FROM 20 MIN. SOMETIMES FOR ALL DAY.
ALSO THE CAR HAS A ROUGH IDLE WHEN IT IS COLD. WHEN IT WARMS UP FOR A COUPLE OF MIN. IT RUNS GREAT. CAN I GET ANY IDEAS

You could have a faulty compressor clutch magnet. When they go bad, they commonly blow fuses. The other possibilty is that the wire is touching ground somehow.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope :)
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM