Front Heater Controls noisy between LO - HI

garypopegarypope Murfreesboro TNMember Posts: 1
edited December 2015 in Honda
My heater works perfectly on LO or HI but anywhere in between .. it starts to rattle like its struggling to open a flap or something (sounds mechanical). Is this something to do with the head unit or is it something mechanical at the back of the unit.
I can only have the heater blazing hot or very cold nothing in between works. I have the auto type heater controls.
Same happens on full auto mode when I adjust the temperature between hi and lo.
Any idea what the problem is and the fix?
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