where is heat control valve located in 1993 aurora w/ 4.1 engine

That car doesn't use a heater control valve like our older cars it uses a computer and "blend doors". There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online