Help with A/C

My a/c is only working on max 4. It's blowing good on setting 4 but when I move it to 3 nothing comes out, less than setting 1 would. All the settings are like this except 4. Has anyone had this problem? It worked fine 3 days ago, today is the first day I've drove it and just noticed this. Thanks

 

It's the blower motor resistor. Do a brief search on the forum and you will quickly find the thread and the cure.

 

Thanks man very helpful

 

Yeah,
beondwacko is right .... I'd also check the fuses as well. I had an old vehicle that ran a separate fuse for the "high" speed wire.