I just changed my heater control valve today. I was able to get the part from Amazon for $98. If you get it from Autozone or O'Reilly's you can expect to pay around $130. The part Motorcraft # YG-378
usually it's the heater control valve aka hot coolant control valve. they are known to fail on this car. it could also be the heater core. only way to find out is to have it looked at by a mechanic you trust. dealers usually charge too much by the way
In 2012 about $40
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
A heater control valve is simply a water valve which allows more or less water to circulate through the heater core, depending on how much the valve is opened. When the engine warms up it heats coolant (mostly water) in the water jacket of the engine. To keep the engine from overheating, the water pump circulates water through the radiator once the engine temperature reaches the set-point of the thermostat. When it's cold outside the engine STILL reaches a temperature that allows you to make use of the engine heat when you open the water valve of the heater. Heater control valves take many forms but basically they all do the same thing; they open to allow heated engine coolant to circulate through the heater core or they close to stop the coolant from flowing. Heater control valves can be manual (cable controlled or even lever controlled), vacuum (which allows the engine vacuum to control the position of the heater control valve based on where you set the control knob) or electrical which allows for greater flexibility and even allows the auto manufacturer to connect the heater controls to a computer or other electronic control device.
There is a technical service bulletin for this problem. It's either the PCM (powertrain control module) or the Idle Air Control Valve
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 heated air temperature is controlled by an air valve or flapper that changes the amount of air passing through the heater core, and doesn't actually have a valve that controls how much hot water goes through the heater core. There are flappers that also control where the heater air ends up, ie. defrost, on the floor, through the upper grilles in the dash. These air valves and flappers can be partially gotten at by removing the glove box and part of the center dash (council). It's not easy to get at unless you take most of the passenger and center of the dash apart.
600.00 to 900.00
Usually, with a plugged heater core there will be a bit of heat but not very much..I've only seen a few so plugged that there was no heat. One way to tell is to (carefully) touch the heater hoses just where they go into the heater core. Both hoses should be about the same temperature. If not and the heater control valve is open - then the heater core being plugged is a very good possibility.
$644.00 New from your local Ford Lincoln Dealer.
The "Heater control" valve or switch is also known as the temperature blend motor/actuator.This is a very common failure on Windstar - BUT - an easy and not too expensive a repair.See "Related Questions" below for lots more detailed instructions on trouble-shooting and FIXING the temperature control problemsTemperature control in most Ford vehicles these days is through the use of a "temperature blend door" mechanism. This door/flapper adjusts the amount of air that passes through the heater core that is then mixed into the air blown into the cabin.This door is moved by a small actuator motor - which in the case of Windstars, is a very common failure point.See "Related Questions" below for much much more...
You would need to specify the size of the heater