How difficult to replace the switch for fan (ac, heat)?

[thirdworldman]

just replaced the blower motor in a 92 corolla, (pain in the ass), now the ac works, but only on high speed. This prompted me to purchase the switch for the ac/heat, my question is: any pitfalls, anything to know beforehand, or is it a pretty straightforward job?

[Dave's]

While it may be your switch, I'd bet it's your blower motor resistor pack. Should be by your blower housing where the wiring plugs in.