heating system help, no heat in car Options

[celicurr]

Ok guys and gals, looking for a bit of help. Got no heat in the car right now, no matter how high I may crank it up... I took apart the trim and took a look at the heater controls. The cable that leads to the engine is still connected, so it doesn't appear to be a problem with that.

I'm thinking the cable may have come off at the other end in the engine, as the heater control dial was a little stuck at one point and required a bit of force to turn it to the higher temperatures. I don't believe it's the thermostat, as my engine temp guage still works fine.

Does anyone have any input into this, or can point me where on the engine I should be looking for something wrong? It's a 5S.

Thanks in advance!