There is no heater control valve fitted on a Ford Escort. The heater matrix is directly connected to the engine's cooling system. To reach the heater matrix, you should remove all the facia unfortunately... :(
doesnt have one
go to autozone.com
99 Durango doesn't have a Heater Control Valve, It only has a thermostat
On my '93 ford escort 1.9L, it is located under the dash, behind the heater control assembly.
A 1999 Dodge Ram does not have a water control valve.
near the fire wall where the heater hoses enter
There is a heater control valve on the 1999 Ford Ranger. There is no thermal vacuum valve on this year of the vehicle.
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
The cirrus does not use a heater valve. The cabin temperature is controlled with the an airflow controlling door inside the dash.
The heater on a 1999 Caravan doesn't have a heater valve. The temp is regulated with a blend air door that is controlled by the body computer and climate controll head.
You left out a lot of details!? Automatic or Standard?, cruise control if auto.?. The only simple thing that comes to mind is the PCV valve and the hose, and if that is connected to the heater core?
its screwed in the right hand side of the engine