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The noise may or may not be related to the low coolant. You may have 'popped' a rock. The fact that the coolant was empty bothers me, but you are in a hot climate. Being an inch low after filling sounds normal, some air was purged from the radiator and used your antifreeze. If after refilling, it goes down again, then there will be a leak and you will have to check all of the hoses with a paper towel - it will turn green if you wipe any old/new antifreeze. It's too soon to expect the hoses to break.
Watch and wait,
Klaus
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98 V70Rawd(101Kmi), 95 854T(85K mi), 88 245(165K mi)
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