why would the heater on ford ranger go out
Low coolant level, stuck open thermostat, etc.
your automobile has had it my son could be a blown headgasket, check for back pressure on the cooling system on cold start.
Tom has a good point, but also there is a vacuum operated valve in-line on the heater core supply hose that can become stuck or vacuum line detach. I'm not sure what year this is, I think 1999 but will be similar or same, it is Ranger
Looking for a Used Ranger in your area?
CarGurus has 6,228 nationwide Ranger listings starting at $1,300.
Search Ford Ranger Questions
Ford Ranger Experts