It could possibly be that your thermo switch went bad. It's kind of a biatch to get to. It's under the intake mani, next to your oil filter.

Mine took a crap on me, so instead of putting in a new one, I just wired a switch into my cabin so I can turn it on and off at my leisure.

If you pull of the boot around the thermoswitch, you'll see what wires I'm speaking of. Just run some wiring from there to a toggle switch...the switch will just complete the circuit. Hope this helps you out.