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See "Related Questions" below for ideas on fixing Taurus/Sable no-heat problemsAnswer
Make sure you have vacuum going in the cab from the engine. The vacuum line runs from the intake to the reservoir, which is a round plastic ball looking thing, and into the cab.

AnswerFeel the 2 heater hoses coming from the firewall - since the coolant runs through the heater core all the time, BOTH of the hoses should be hot.

If one is not, that's a key indicator the core is plugged/obstructed.
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โˆ™ 2009-12-20 01:58:54
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Q: Why would you get no heat-defrost in a 93 Ford Taurus if the blower is working and there is no leak?
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The blower may simply have burned out. If the blower is out then the heater probably still works.

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Defective blower motor or blower motor resistor pack.

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Could be, a blown fuse, a bad blower motor, a burned out blower motor speed resistor, a bad blower motor switch,

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The blower resistor gets overheated and burns out usually because the blower motor is failing also.

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No, that would have no bearing on the blower motor. Check the fuse, blower motor resistro pack, and the blower motor itself.

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mor vehicle info would help, but blower motor can be shot without blowing fuse

If the heater died in a 1993 Oldsmobile Cutlass Supreme would it be a fuse?

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If you have checked the blower motor and it does function when power is applied then I would suspect the Blower Motor Resistor Pack is defective. It is also possible the blower motor speed control is bad, but highly unlikely.

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Assuming the lower speeds are working I would check the blower motor high speed relay in the power distribution box under the hood, if that checks out okay, check the switch.

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Check connections at the blower motor, blower motor resistor and at the switch. You may find a melted connection.