Dash lights go on and off for no reason heat won't turn off and an electric noise is coming from the heater air conditioning in a 1998 blazer what is going on?

If the dash lights go on and off and the heat won't turn off and electrical noise is coming from the heater, there could be a short in the wiring on a 1998 Blazer. This is also possible if the ground wire for these items is not longer attached.