So about a week ago I noticed a loud popping/crackling sound when the ac is on. Only happens on hot days when the radiator fans kick on. I've read that it could be a loose clip of some sort on the bottom of the fan moulding (I think) hitting the blades once they become heat soaked. Anyone else experience this and have a fix for it? Car doesn't overheat and ac blows cold, just that noise when the fans go into overdrive!