Is the battery connected correctly? It's common to reverse polarity especially if the replacement battery was reversed. Make sure you have pos. to pos. and neg. to neg. Not sure why your overheat light come on with the fan. Have you checked the coolant level. China ships their buggies with alcohol based coolant which you do not want for it induces corrosion. Drain the coolant and replace with a high quality glycol based coolant.
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