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As mentioned before, the circuit as you have it is a high pass filter. If you want to do AC simulation, you can go to www.ngspice.com and the following in the netlist textbox: A simple RC circuit V0 n1 GND DC 12V AC 1V R1 n2 GND 10k C2 n1 n2 10F .AC DEC 10 1 1e10 .END and then...

For simple netlists like this, http://www.ngspice.com can be very helpful. This site allows you to run SPICE simulations from a web browser. There is also an example circuit similar to yours that may have helped to identify the problem that you were having.