could be set too high of temp, DANGER! or a difuser tube on the inside that directs the inlet flow has rusted off and the water does not flow the right way inside anymore. or other......?
Car will make when running even if heater core is not burned out.
was there something on your dash that fell in the vent, a bad fan will make noise all the time.
Because it is hot and the heat is making the metal spark.
Temperature control in dash by heater core is broke.
Yes they can make a grinding noise, if they are bad.
make a lot of noise
If it is a single click, from time to time, it is the thermostat cycling on and off, and it is normal.
The only noise they could possibly make would be there wings flattering
Angels do not make any noise or do anything that would betray their presence. In fact, if you did not read about them in books you believe to be true, you would have no reason to think that angels exist.
What kind of noise WOULD a cat make?
The blower motor may be failing or there could be debris caught in the fan.
That would be a rattle.