Is the fuse blowing immediately? Have you tested for shorts to ground? What "A/C Coil" are you referring to? The blower resistors?
The A/C Amplifier is behind the ECU:
http://www.cygnusx1.net/Supra/Librar....aspx?S=AC&P=8 A real pain to get to if I recall.
Is the blower working?