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To fix the heater in a 1992 Buick LeSabre, start by checking the coolant level in the radiator and reservoir, as low coolant can cause heating issues. Inspect the heater core for leaks or blockages and ensure that the heater control valve is functioning properly. Additionally, check the thermostat and replace it if it’s stuck open. If the problem persists, consider examining the climate control system and the blower motor for any electrical issues or malfunctions.
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