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Check heatertreater.net for diagnostic information and a fix for the blend door/actuator problems endemic to this model.
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Deep under dash near heater core. Lots of work to get at.
The Taurus does not have a heater control valve. Coolant flows through the core at all times. Be sure to review the "Related Question" below for much more about Taurus temperature controls
The heater matrix can be replaced by removing the heater core and temperature control cables. Replace the heater core and the control cables.
Unfortunately the entire dash must come out to replace that unit.
LOTS - it is virtually inaccessible .
There is not a valve that regulates the flow of coolant through the heater core. The Taurus/Sables never had one like that.Coolant flows through the heater core at all times, no matter the temperature setting.Temperature adjustments are made by controlling how much air flows through the always hot heater core, by the opening and closing of a damper-type door inside the ductwork.This temperature blend door is controlled by:1986-about 1995 - A stiff wire cable from the dash control to the door1996 and newer - a small electric actuator motor that positions the temperature blend door inside the ductwork.NOTE: this parts has a high failure rate, but is an easy do-it-yourself repair.For a very comprehensive listing listing of various problems that can happen with the heating system on Taurus/Sables, check out the various "Related Questions" below.AnswerThe Taurus does not have a heater control valve.No control valve is needed as the engine coolant flows through the heater core all the time.Temperature adjustment is done with a wire cable from the front control knob / slide control to a door inside the ductwork. This door controls the flow of the air through the heatercore - the more air moving through the core, the hotter the air being blown into the car.With the total redesign of the Taurus/Sables in 1996, Ford changed from cable connections to a small electric actuator motor to control the temperature blend door.The Taurus does not have a heater control valve. Coolant flows through the core at all times. Be sure to review the "Related Question" below for much more about Taurus temperature controlsThe Taurus does not have a heater control valve. Coolant flows through the core at all times. Be sure to review the "Related Question" below for much more about Taurus temperature controlsThere isn't a 'valve' for the heater anymore. The coolant flows through the heater core all the time.Temperature is controlled by:Temperature blend door - control how much air travels through the heater core -A small motor that controls the blend door - a rather common failure point.See "Related Questions" below for more
the heater control has a thermostat for the heater only. that thermostat needs replacing
the temperature control actuator is on top of the heater box under the dash. you have to remove the dash to get at it. a repair manuual will show what screws to remove
You can replace the balls in the heater control panel on an XS ARA Picasso by removing the front cover of the heater control panel. The panel lights will then be visible.
Remove the heater control valve and replace it.