No Heat!
 

I have a 2003 Galant ES 4 cyl. When I turn my heater control (left knob) to the coldest setting (all the way to the left) I get a loud clicking sound coming from inside the dash. If I turn the knob two clicks to the right, the sound stops. I've searched and been unable to find pictures or explanation on where to locate the Heater control shut off valve.If you can point me in the right direction......thanks!