humming for awhile is normal as it is to keep the A/C purged and dry it out. However, constant is not good and as you experienced, a dead battery is the result. There is a fan relay that I've heard when goes bad will keep running even with the key off. Check the fan relay under the lip of the radiator to see if it's the culprit.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.
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