I have a very high frequency noise coming from the front climate control when the fan is working- silent when fan is off and then very noticeable when setting to auto. The noise is constant and does not change with speed or radio etc

Has anyone else experienced this ??

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2008 TDV8 Vogue
2011 TDV8 AB (former LR1)
3.0VSE - 2015MY
Corris with Black, RSE, 22 turbines, privacy, deployables
2023 L460 P400 SE in silicone silver
2022 L460 P400 AB in black with ivory (fully loaded with deleted rear exec pack)