My radio for my 1996 4.3L chev blazer will periodically stop working on me, it acts as though the antenna is disconnected, just static but antenna is fine, what is weird is that at the same time the heater fan will stop working. This just comes and goes so it is hard to troubleshoot. Any ideas, what is common between the radio and heater? it is just annoying now but with winter coming a reliable heater would be nice.

 

Welcome to the forum Chris.
It's always easier for us to help when you post your vehicle info in your signature, or at least in your post.
Wiring diagrams are not the same for all vehicles.
You can edit your original post to add the year, make , model