I went from only high heat to no heat in about 2 - 3 days.
You probably have a broken wire at the heater control. If the shaft nut is indeed loose, and if you pull on the knob, expect to break the remaining small wires that connects the heat-level potentiometer to its circuit board.
The wires can be fixed/resoldered, as opposed to buying a new unit for over $600.00. I hope that this solution helps you.
Thanks for choosing FixYa for assistance.
Try pulling off the temp. control knob and tightening the shaft nut.
I doubt if pulling the knob off did any damage to the remaining wires. I have tightened the nut on many highlanders and they have left with a properly working system and have not had to replace the unit. there are many where the shaft was loose for awhile and the damage had been done and the tightening had no effect. but this is a quick, easy, first attempt at a repair.
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