First check coolant level and correct if low. Sometimes this is all it is. If not, the cooling fan comes on due to a water temp sensor switch. Local auto parts place AutoZone, O'Reilly, Advance can help you find it. Probably bad. The other problem of dead battery is something staying on after car is shut off. Look for aftermarket electronics wired to a non-switched source.
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First check coolant level and correct if low. Sometimes this is all it is. If not, the cooling fan comes on due to a water temp sensor switch. Local auto parts place AutoZone, O'Reilly, Advance can help you find it. Probably bad. The other problem of dead battery is something staying on after car is shut off. Look for aftermarket electronics wired to a non-switched source.