Off and 4 would be the only positions that would work, 1,2,3, all go through the resistor pack.
unfortunately the a/c interlock also goes through the resistor pack, so depending on which resistor has burned out, the a/c might also not work unless you bypass the interlock that stops you from running the a/c while the fan is off.
The interlock is there to prevent the a/c evaporator core from turning into a lump of ice.
Just some noodling here, but is the resistor pack different for A/C and non-A/C? I wonder because I tried the resistor pack out of my DX (which has A/C) in my LX (which doesn't) and none of the fan speeds worked at all. The pack out of the DX also had a jumper wire on it. I presently only have speeds 3 and 4 and its a bit annoying running on 3 all the time.... although, I had all 4 speeds randomly a little while back for about two days.... I'd really like to get a good one if anybody has one around. Mazda wants $56 for a new one.
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