Immediate Ideas Needed

My blower fan (A/C; heater) works intermittently in my '99 Durango. Lately, it has not worked a lot more than it has worked. It is getting cold in Northern Illinois and the fan is needed for heat and defrost. I will be trying to fix this today. Anyone had this issue and fixed it? I will post what I try, until I fix it. I will check this thread a lot today for solutions/ideas. I may not always respond, but I'm reading it. I also will post what I try.

So far, all I have tried is playing with the switch quickly and gently hitting around the switch. This has no effect.

ThanksO:)