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 problems
Temperature 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...
The "Related Question" below is an extensive discussion on the 1999-2003 temperature control valve / heater control valve. It is likely the information will be similar to the 1997 / 1998 Windstar
It does not have a heater control valve.It does not have a heater control valve.
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The heater control valve on your Pontiac Grand Prix is located behind the kick plate, on the passenger side of the passenger compartment. The heater control valve is near the heater core box.
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The heater control valve (temp blend door) is located behind the dash assembly. The dash assembly has to come out to gain access to it.
If you are looking for a valve in the heater hoses that restricts coolant flow, it does not have one.
in enging compartment