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Sending unit is new so why does water temp gauge not work on 99 marquis?
Wiki User
∙ 13y ago
sounds like your temp switch is bad you will need to replace it. Maybe the thermostat is stuck open and the engine never heats up. <- even if the thermostat is stuck open the temp gauge would register heat it would just take longer for the engine to heat up for it to register.
Wiki User
∙ 13y ago
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