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Hi guys, hoping some of your might be able to shed some light on this.

I've noticed over the last little while that if I start the car from stone cold in the morning and let it warm up (sat there idling for a few minute) it makes a sort of grumbling, pulsing noise. It gets quieter as it warms up and then goes away and only does it when stone cold.
I've not had a chance to investigate or take a video but are there any common causes for this?
My first guess is the alternator as it's due to be replaced soonish anyway; do the bearings make a grumbly/rattly/pulsing noise when they go?
 
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