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- - after shutoff (https://volvoforums.com/forum/volvo-xc90-9/after-shutoff-21532/)

sean177

07-13-2008 12:26 PM

after shutoff

hey guys
yesterday after i shut off the engine i heard a sound sort of like a hydraulic humming or adjustment being made automatically. i have never heard this before or at least i never noticed. does anyone know what it could have been. the humming came in like 3 second intervals about 15 seconds apart.

tech	07-13-2008 08:40 PM

RE: after shutoff

From inside or outside?

mncx	07-13-2008 11:24 PM

RE: after shutoff

It could be the Vacuum switch fo brake booster pump broken beside the air filter housing (orange connector) if it leaks or cracked can cause vacuum pump to cycle even after key is off.

tech	07-14-2008 06:04 PM

RE: after shutoff

Or could be ETM or also the incar temp sensor in the climate module.

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