Phaedra,  Not sure who is convincing whom of what, exactly, but, according
to Hoyle (Bentley, too) your engine is suppose to kick itself up to a higher
rpm level, as I grasp these things, when you activate the AC.  Little switch
provides extra air to the intake manifold.  If this switch (idle stabilizer
valve) is not activating something may be electronically kaput.  Or, like
me, merely mechanically inept.  Checked your fuses?  Cheers,  Dave Gunning