All of a sudden the A/C compressor in my 99 Silverado 4x4 (5.3L)
doesn't seem to cut on at all anymore.  The blower works fine and up
until a few days ago the air coming out of the vents was been nice and
cold.  However, now nothing happens under the hood when I press the
button to activate the A/C.

I checked the fuse next to the relay and it's fine.  Is there a chance
the problem is something simple like the dashboard control module
itself?  I had to change out the transfer case switch module about 5
months ago.

Thanks for any help.

Casey