Dodge Repair: heater fan, fan switch, switch unit

Question
I bought a used fan switch unit for the dash. A friend said it could be a relay that is tucked up under the dash, but I have no idea where it would be. thanks for info on backup switch, will look there.
-------------------------

Followup To

Question -
1996 caravan. I only have 1 speed on my blower motor. High only.  There is no other speeds. I bought another unit and it does the same thing. I also have aproblem with my back up lights and can't locate the switch for this.  Thanks in advance for any info

Answer -
Hi,
What kind of unit did you buy?  The back up light switch is located on the side of the transmission.

Cowboy 1104

Answer
Hi,
If the fan is working on high or any other mode it can not be the relay.  if the relay is bad it would simply not work.  Pull the fan switch and with a volt meter see if you have voltage comming off of the other modes.  If you have voltage comming off of the other modes then it is either in your wiring or in the blower moter itself.

Cowboy 1104