190e.

Mine did the same thing. I fixed mine for a few months, then the wife broke it again. So I "fixed" it so it would not go lower then the second speed. I'll try to explain. There are plastic and copper tensioned dents that the switch stops and rests on at each of the blower speeds. Usually at the lowest setting a piece of one of these plastic stops breaks off prohibiting or trapping the switch at the lowest setting. I operated on mine by cutting a small opening with a Dremel in the upper left region where the low speed area is. I bent the low speed copper tab slightly (the copper tabs make the electrical contacts for the different fan speeds) so the selector piece would rest slightly beyond the original stop. If you treat the fan switch gently at the lower speeds, not letting it slam or forcing it to the stop, it will be fine. But my wife got a bit aggresive with it and bent the copper stop causing it to lock up. Soooo I bent the taps so it stops at the second speed. Works fine and with an older car and an older fan the second speed is still slow.

Hope this make sense?

Tinker

P.S. It is held in by two screws. Pry off the wood trim cover, Remove HVAC controls. Remove two screws and it comes out throught the HVAC openning.