I have a 97 S-10 with a heater control switch that will not work on the highest speed. It is a four position switch and the fan does work on the lower 3 settings. Any suggestions out there???:frown:

I have a 97 S-10 with a heater control switch that will not work on the highest speed. It is a four position switch and the fan does work on the lower 3 settings. Any suggestions out there???:frown:

I WOULD SUGGEST PULLING THE SWITCH OUT AND CHECKING FOR A LOOSE TERMINAL, OR YOU COULD JUST GO TO A YARD AND SEE IF YOU CAN FIND A NEW(FOR YOU) ONE OFF A WRECK. I DO KNOW THAT THE MANUFACTURERS OF ALL VEHICLES DO NOT SELL JUST THE FOUR POSITION SWITCH, YOU HAVE TO BUY THE WHOLE CLIMATE CONTROL CENTER.

High fan is usually run of of a relay.
Check fuses and power to relay.
MT