Blower heater AC motor blower switch shorting

Ok everyone with experience replacing these parts:

I installed my new resistor and harness and everything works fine EXCEPT now I get a loud electrical kind of ticking noise from under the hood whenever I use the heater on the upper dash vent position (And if the AC button is turned on).

All else is perfect. WTF is that noise I’m getting which seems to come straight from the AC compressor under the hood?? Ughhh

 

Another dumb question.....
.....since posting in this.....did a little more research......does the resistor and blower motor have to be replaced together....
I read one damages the other about half the time when going out....so its best to replace in pairs???.....

kinda like a bad battery can cause a alternator to fail...and vise versa......