`I 'Ve got a 95' lsi and the heater has four settings, but mine only works on the last two what could it be, b/c if you leave it on the third setting all the time it gets too damn hot, also my passenger side vent next to the pass. window does not blow air , any help would be appriciated.

I had the same problem with my '96 and I did what the dealer said couldn't be done. I removed the switch and cleaned the contacts then put it back together with a wire tie around the switch housing to keep it tight. If you chose to do this, be careful or you'll lose the detent ball and spring when you take it apart.

My solder connections have come loose twice
but it's been 6 years since I've had to fix it.

Remove switch, re solder the wires onto the
contacts on the body of the switch and it should
work fine.

as for the vent not blowing air, maybe a hose disco'd?

OR MAYBE SOME FIELD MICE TOOK UP RESIDENCE IN THERE