98 ranger chime problem 30 minute intervals

i need some help. i have a 98 ranger xlt. great truck, but when i start the truck and start to go, it starts chiming in 5 groups of 5 every 30 minutes for the duration of the trip no matter how long the trip is. i have been to 2 dealers and one repair shop and none has a clue. any help will be appreciated.

regards,

don

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donald ray
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