The fan is not controlled by the A/C switch. It needs to be turned on in addition to the A/C switch when using the A/C.
These wiring diagrams should help:
http://www.panteraplace.com/El...20BLOWER%20MOTOR.pdf
http://www.panteraplace.com/El...EM%20%28EARLY%29.pdf
http://www.panteraplace.com/El...TEM%20%28LATE%29.pdf
John
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