My 90 model AC fan switch works only on #4-High,
replace just the selector switch or is problem elsewere in the harness? seems like probably a common problem, also I popped the clock unit out to look at the switch and after re-install the clock doesn't light up at night anymore,read out is OK. Thanks in advance for the help

if i remember correctly from a previous post the fan sw. problem is either a bad relay (there are two in the circuit- 1 for positions 1,2,3, the other for position 4) or selector switch resistor pack (which is bypassed at position 4). clock, i have no idea, maybe a loose bulb from R&R.
Steve
90 ix