A thermostatic radiator valve is a valve that is connected to the hot water heating system. It can control the room temperature by regulating the amount of water that goes into the radiator. The valve is able to control this by sensing the temperature of the air.
Pressure safety valve-are the valve who are designed such that it can control the pressure , like in the water blowers etc,and Temperature safety valve are those who are used to regulate the temperature like, in water boilers.
The heater output temperature is regulated by airflow control doors inside the dash, not a water valve.
A Dodge Durango does not have a water control valve in the heater plumbing. The cabin temperature is controlled with airflow control doors.
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
A 2001 Chrysler Town and Country does not have a water control valve in the heater system. The cabin temperature is controlled with electric motors on airflow control doors.
The heater is controlled by the same panel as the fan switch. The temperature is controlled by a cable that moves an airflow control door inside the HVAC housing. There is no water control valve if that is what you are looking for.
A 2000 Chrysler 300m does not have a heater valve. The cabin temperature is controlled by airflow doors.
You insulate the 3way valve for the FCU to control temperatures. If the valve is left uninsulated, the contents will either lose or gain temperature depending out external conditions.
The cirrus does not use a heater valve. The cabin temperature is controlled with the an airflow controlling door inside the dash.
Check into the temperature control valve--this is different than the thermostat.
Heater temperature control valve.