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Why would a 1995 Mercury Sable heat work only on low reguardless of the setting even after the blower motor and blower motor resistor are replaced?


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Wiki User
2005-12-15 06:30:15
2005-12-15 06:30:15

It could be a thermostat that is stuck open or maybe a bigger problem...like the blend door is either jammed or broken as well.

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When the heater resistor goes, your climate control fans will only work on the fourth setting. You can get a new resistor from any Ford Lincoln Mercury dealer, though they may have to order one.

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Usually, all that happens is that you are left with only the high speed setting, no matter what setting you put the switch on. In some cases though, the wiring or harness can be damaged near the resistor and should be replaced or repaired along with replacing the resistor.

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Assuming you're talking about the blower motor, because the blower motor resistor is faulty, and needs to be replaced. On the high setting, it doesn't go through the resistor - on the other settings, it does.

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It is either the blower motor control switch or the blower motor resistor pack. More than likely it is the resistor pack. It must be replaced or just live with it until it fails completely.


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