Why would there be no voltage to the AC compressor clutch?

Answer 1

the pressure switch which is located on the dryer/accumulator senses when the refigerant level or pressure is low and shuts off the compressor to prevent catastrophic failure of the compressor due to possible lubricant loss. the electronic control panel in the dash then flashes to let you know your refrigerant is low. you obviously need to recharge the system at least. and to do that you have to get the compressor running. there may be other ways but the way i do it is to make a little jumper out of a paper clip that will plug into both holes of the pressure switch plug that i mentioned earlier. this will lock on the compressor once you reset the electronic control panel in the dash and the only way I've found to do this is to simply disconnect the negative battery terminal. this will get rid of the flashing ac symbol but it will also delete your radio preset stations. you can now proceed to recharge the system and check for leaks etc. if you do this yourself be sure to remove the jumper in the pressure switch plug and reconnect it to the pressure switch when you get thru charging the system

The contacts in the ignition key switch have been known to not make contact when the ignition is turned on. Remove the switch contacts. It can be removed from the key lock. Spray some contact cleaner into the contact cluster through some small openings, reassemble the switch and work the key back and forth to clean the contacts. Then see if the AC clutch gets voltage. Note that there is a little light in the AC pushbutton on the AC controls. The light some come on if the circuit to the clutch is complete

Check to see if the A/C fuse is bad first. K.I.S.S.