I have had an issue for a while where if you turn the blower to 3 and the thermostat dial is on heat, then I get this high pitched noise kind of like a dog whistle or high pitched electrical frequency noise.
If I turn the blower down to 2, it goes away! Or if I turn the thermostat dial down to almost mid point it goes away. I believe the noise is still there at 4, but the noise of the blower drowns it out.
The high pitch noise makes it unbearable to be driving with the heater blowing on level 3.
I had the blower motor replaced today thinking that would fix the issue, but it did not! I'm now at a loss as to where the noise is coming from if it is not the blower?
Anyone have any ideas or experiencing the same issue?
Edited by boltonebob, 26 January 2011 - 11:23 PM.