Is it normal for fan to run intermittently 2 hours after turning car off. That's what was going on last nite. On Monday, I had to take my '03 530i in due to a completely dead battery after sitting for 4 days. I purchased the CPO 530 1 month ago. The battery was new in October. The dealership couldn't find anything drawing power. They did a "deep charge" and it's fine 4 days later. But that fan was running and I've noticed it before and didn't think much of it.