i had the same issue. if you look behind your bumper, there should be a little rectangular relay with 2 wires attached to it. well on mine the wires came off due to rust and corrosion.
it is some sort of relay for the condenser fan. and my A/C was not working so i tested the A/C condenser fan relay and it was not recieving a negative charge from the battery.
So for the wires look at the bottom of the Rad behind the bumper and there should be two wires going into a relay that is bolted onto the rad support. If you find it, remove it and check the wire connections. Then from there check the relay's for the condensor fan to make sure they are recieving a negative charge from the battery.
I had to add another relay to the condensor fan relay to make my A/C work. and when that was fixed my idle RPM's went from 500RPM up to 900-1100RPM at idle which it never did before but is supposed to!