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Unusual rumbling noise in the dashboard when the climate control HVAC is set to REST?

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Old 09-11-2015, 11:41 AM
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2019 Maybach S560
Unusual rumbling noise in the dashboard when the climate control HVAC is set to REST?
I have this unusual rumbling noise when the climate control/HVAC system is set to REST or any temperature setting above LO.

http://youtu.be/eISENKwyrXU

Seems to be linked to the flow of heat? Could this be related to some issue with the heater water valve? Is there a recirculation motor on the valve assembly?

IDEAS?
Last edited by ChesapeakeLimo; 09-11-2015 at 11:43 AM. Reason: Typos
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Old 02-15-2016, 06:50 PM
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UPDATE:

The rumbling noise was actually a gurgling noise coming from the heater re-circulation motor in the engine compartment at the firewall. Was a bit low on coolant. Topped it off and problem resolved.
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