The A/C magnetic clutch receives its power from the A/C Amplifier ( right side of Instrument Panel).
If the A/C switch is turning on, then you do not have a power supply issue and the most likely fault would be the amplifier or a broken connection. At the mplifier, check the Black/Yellow ( Pin # 9 ) for battery voltage. If voltage is available, the continuity between the amplifier and A/C compressor clutch is broken.
Otherwise you could have a faulty amplifier.
Friday, June 4th, 2010 AT 8:33 AM