Bad low pressure switch or low on freon if in AC mode, If in Defroster mode the AC comp cycles off and on the prevent to hot of air hitting a frozen windshield to prevent cracking
It can damage the compressor.
Low freon
could be your a\c clutch in the compressor.?. or maybe pressure leaks.
The compressor is probably froze up.
Indicates low refrigerant charge - compressor not starting
I would start with the basics and look for a blown fuse - there should be a fuse for the air conditioning switches , A/C compressor clutch
The compressor cycling on-off is usually an indication of low refrigerant level, which in turn means that there is a leak in the system somewhere.
They sell bypass pulleys but you may need to remove compressor to install (this I'm not sure about but looks like you have to.) I s there an easier fix?
If just a fuse, a couple of dollars. If compressor of evaporator, thousandIf just a fuse, a couple of dollars. If compressor of evaporator, thousand
The refrigerant level is probably low. When the compressor turns on it pulls refrigerant from the low side and as soon as the low side pressure drops below a certain point, the sensor disengages the AC clutch. If you haven't already converted your AC to 134A, now would be a good time. All vehicle AC compressors leak a little refrigerant, simply because of the design of the system. The system may not have any serious problems even though it has lost a little pressure.
The A/C compressor is clutch driven, when electricity is applied to a coil, it engages the clutch. Most likely the coil shorted out in the A/C clutch on the front of the compressor.
it is probably the ac compressor locked up