It's probably a small electric vacuum pump which should be under your dash or behind the front compartment door. It provides vacuum to your dash heater/ac controls. Most likely there is a leak in the vacuum lines from dry rot.
There are lots of excellent posts on this forum even with pics on how to chase it down and repair.
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Don
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX
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