1990 chevy pickup, changed the water pump and new hose. Trust is still over heating. No heater or a/c. What could this be caused from? Little money and not sure what to do.

Try reverse flushing the radiator and heater core. If the problem persists, the radiator may need replacing, due to phosphate scale blocking many of the internal passages. Afterwards, refill with a 50/50 mixture of the proper antifreeze and distilled water. Never use tap or well water in cooling systems, due to the high mineral content.