FORD RANGER HEATER HEATER CORE

1994 Ford Ranger 3.0l V6 4x2 60,000 Miles, Manual Transmission. Heater Is Not Working. Replaced Heater Core, Thermostat, Gasket...

I Have All The Heat I Can Use. So Far I Have Replaced The Vacuum Valve That Shuts Off Water Flow To The Core And The Reostat In The Dash...