fan motor switch problem
 

I have a 94 sierra 4x4 and I have a strange problem. My blower will not go on first thing in the morning. When the truck warm's up it works fine, or if I leave it on high when I shut the truck off at night it will work when I start it in the morning. Not really a big problem just annoying. Anyone heard of this before?

sounds like the switch may be going I had this same thing happen to me a few years ago in a dodge ram.