Long time lurker, first time poster, 93 Ls400. Figured I add to this post due to me having somewhat the same situation. NO HEAT. Changed thermostat, burped and come down to this so far. Thing is I can move the heater valve up and down with minimal force, this is telling me, in a sense, that the cable is not broken. A/C works fine but no heat. Heat was working awesome when I purchased the car back in April this year. So, when i have the heater valved turned all the way up I still get no heat, whether its up or down. I am in no way a mechanic but I do have the know how to replace whats broken. At this point I'm not sure whats broken. Please help!!
EDIT: Also would like to add, that when I manually lift the lever it will go halfway, not knowing how far up it should go. So it would be pointing toward the radiator vs up towards the hood. I can add a pic later today.
Again, is that as high as it goes? I will be popping off the cable in less than 2 hrs. just don't want to do anymore damage.