Yes, under the right front wheelwell there is a Relay for the Compressor. It is lower than the compressor but in the wheelwell. Check it for corrosion or it just may be burnt out.
If you want a quick fix, the system does have a Diagnostic plug but usually only the Dealer has the machine to test it. The nachine only works on Ford products and some Independent shops will not buy a machine that does not do all the cars.
I understand American suspension.com has parts for this. You can check with other Parts stores.
There is an off/on switch in the drivers side rear cargo panel. If you recently had it jacked up, the Mechanic may have forgotten to turn it back on.
The buzzing is probably the compressor. You may have a bad air line somewhere. Or, you may have a bad solenoid. These can be check with an ohmmeter.
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