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If the heat isn't working in a 2000 Grand Marquis, it could be due to several issues. Common causes include a low coolant level, a malfunctioning thermostat, a clogged heater core, or a failed heater control valve. Additionally, issues with the climate control system or a faulty blower motor could also prevent heat from properly circulating in the cabin. It's best to check these components to diagnose the issue accurately.

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1mo ago

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