Ford Ranger Heater Control Valve

Th Heater In My Nephew's Ranger Has Quit Working. I Am Being Told That The "valve" Is Defective. My Question Is How Hard Is It To Replace...

Have Replaced This Valve Three Times In Last Year. Cannot Go Through Winter Losing Antifreeze. This Valve Is Leaking Where The Rod Connects...

My Heater Control Valve Is Not Hooked Up Do You Have A Diagram Of The Heater Hoses So I Can See How To Hook It Back Up

I Recently Replaced The Thermostat In My 1998 Ford Ranger 4 Cyl. 126,000 Miles. The Engine Was Running Cold And Now It Runs Just Right. But...