Only makes the sound when it’s really hot out like in the 90s, Sounds like hitting a “mid range” string on a guitar one time. starts fine runs fine voltage regulator on the dash indicates 13-14 volts when it’s running, battery is 5 years old this month it is the original Panasonic 2015 LX 570 but I always top it off with distilled water every year so it’s never been low. Been doing this the last couple years In the summer, just wonder if anybody else has a sound Like this happening under the same circumstances?
