My Astra 1.3 cdti (Fiat engine) has started making a strange vibration / humming noise when I switch the engine off once thoroughly warm. The noise persists for 10 seconds or so after the engine has stopped, and it comes from a small component situated under the offside front chassis leg, just forward of the front subframe mounting, more or less under the headlamp, but back a little. The component is mounted on rubber bobbins, and has a wiring loom plug attached. Have any of you guys any idea what it is and what it does, and is it potentially serious? I'd be very grateful. Cheers
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