heater/ac

have a 92 cherokee laredo. Heater and ac worked fine then suddenly stopped working altogether. Now, blower does not work, nor does ac compressor. The heater control still works, but no blower and no compressor. Any ideas?

There is a plug that comes from behind the compressor (under the hood) small one could have came unpluged or may be dirty, also could possibly have a pinched hose.