Heat problem

My 94 Sable does not have heat at all. I tested the temperature control, which is a poteciometer, and it's working OK; I measured its resistance and
it changes smoothly. The AC works fine, but it cools even when I turn the temperature control to hot. A few months ago the radio started to have bad reception. After a while I discovered that by turning the temperature control nub one way or the other the reception got better or worst. It's not static noise from the potentiometer. It's more as if some electronic circuit was causing interference. Anyone know anything about this problem? Thank you, Tony
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Alpha One opined in

Assume radio works best with heater system switched OFF.
Sounds like a bad harness ground behind dash.... or poor dash support ground to body
Static IS interference... if you mean there's a whining, or clacking noise in the radio, that's the servo's otherwise: You might just try to find a heater control replacement in the salvage yard... remove the control same as a radio.
Google for directions
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Alpha One wrote:

Do you have the manual or digital climate control? If its digital, does the controls seem to work? Is the air coming out of the correct vents in the different modes?
Bob
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I have a manual climate control. The air comes out of the correct vents as set by the selector. It doesn't matter if the heat or the air condictioning is on or off. Rotting the temprature knob afects the radio just the same, but it will not afect the temprature.
Tony
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Alpha One wrote:

Does both heater hoses appear hot when your trying to use the heat? If they are, you have water flow through the heater core. If not, you may be low on water, have a plugged heater core or other obstruction. You might try to manual flush out the heater core and see what kind of water flow you have.
If the heater core appears OK, then you probably have a blend door actuator problem. The pot on your HVAC controls send a voltage to this actuator to control its position. This controls the air past the heater core.
Bob
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