[jnuckols]

Mine, on a '95 Civic, would not pull in at all. Even if I applied 12 volts straight to the clutch. I ended up replacing the clutch to fix it. On the '95 you can replace the clutch without removing the compressor. I had to remove the compressor mounting bolts to move it to a position where I could reach everything, but I was able to do that without disconnecting the refrigerant lines.

If you haven't already done this, you might test the clutch by disconnecting it from everything else including whatever thermal protector your compressor has. Then you can connect 12V directly to the clutch coil. Be careful that you don't let your positive lead touch anything else. Only connect the power momentarily. The clutch should pull in. If it does, the problem could be high resistance in the relay or the thermal protector.

Otherwise, I don't know what it might be.