Classic symptom of low charge.
Compressor comes on, low pressure switch turns it off. Cycle repeats.
The right way to fix it is with a set of manifold gauges so you can read the operating pressures and bring the charge back up.
A cheapie way would be to pick up an inexpensive Interdynamics recharge kit. SLOWLY add 134a until the frequent cycling stops.

AL

Red '98 SVT E0 3098/6535
KKM, Elizabethan EGR Plate, TH fix
OMP front brace
Hightower rear brace
DMD
B&M with reverse lockout disabled and centering spring removed
Mobil 1 oil and trans fluid
A6 Side Markers, Optima orange, Horn recontent
Painted Sail Panels
VooDoo Knob and pedals, RogerR deadpedal
Blau Houston & CD changer
Cup holders that work
Donnelly mirror
BAT Sill Plates
and a Bullitt fuel door