As far as removal, gently squeeze the two metal arms on each side of the switch body together and you should be able to fenniest it thru the dash panel.
As far as heating, assuming its not an electrical wiring/cable issue, I had a situation where the two vertical electrical posts had to be separated with a thin piece of non conductive material... it seemed when I would pull or push the switch knob, the two vertical posts would touch enough to heat up where your two wires are connected.
hopes this helps, Jim