Your truck doesn't have a heater control valve. It has heater hoses that run hot water straight into the heater core on the back of the engine on the passenger side. If your are having a problem getting heat inside the truck, but the gauge shows heating up ok, then you probably have a bad blend door or blend door actuator...Where is the HEATER CONTROL VALVE on a 1997 FORD EXPEDITION with a 4.6L engine?
there is not one there is a blend door motor that changes from cold to hot very common problem that it goes bad
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