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Thread: 2003 mercury sable heater

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  1. #1

    Post 2003 mercury sable heater

    upon completing installation of new thermostat, gasket and new anti-freeze, heater still does not get hot. Can you help please?

  2. #2
    Join Date
    Jan 2007
    Posts
    4,850

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    Good morning Bill,

    Feel the heater hoses where they enter the firewall and make sure they're getting warm. If one is kind of warm but the other isn't, the heater core is plugged. If they're both warm, the core is flowing, but a problem exists in the heater box (a blend door could be stuck).

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