1998 Blazer Fan Control High Setting

My blower motor gave out so I replaced it, it's working. The only problem is the high setting isn't working anymore. Should I just go in and replace the relay or could it possibly be the control switch inside the cab?

It's -30 degrees here today so any time I don't have to spend with cold hands would be great :)

Thanks!

Could be a fuse or the relay. Locate the high blower relay, it is mounted to the heater housing under the hood. The high blower relay has 2 orange wires. The larger one should be HOT at all times. The smaller one comes from the fan switch, it should be HOT when the ignition is in the RUN position and the fan switch is in the HIGH speed position. The black wire should be less than 5 ohms resistance to ground. The purple wire goes to the blower motor. The dark blue wire comes from the blower resistor and carries speeds 1, 2, and 3. Check it out and post your results.