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The manual heater system for your truck does not appear to have vacuum lines for the controls. Everything is manual and uses cables. The heater system is usually in the bypass circuit of the coolant system so that water circulates within that system regardless of the position of the...

As a preliminary test you can feel the inlet and outlet of the heater hoses and see if both are "HOT". If so, I would suspect the adjustment of the blend doors. If for some reason the coolant filter is clogged, or even the wrong one, there would be no flow therefore no heat in the return hose...

Overheating at speed is an indication of a bad fan clutch. The reason speed inhibits cooling is the turbulence that develops in front of the vehicle which actually reduces airflow when you exceed a certain speed. You already have the understanding based on your narrative that beyond a certain...