I have a 1991 Plymouth Acclaim that is overheating & no heat coming inside. I've replaced the thermostat, radiator, heater core hose, water pump & fan relay. Antifreeze is not circulating. I've run out of ideas.
It may have an airlock on it you have to remove plug on top of tstat housing to bleed air out. Then once coolant reaches there reinstall plug. Also you migh ttry a new rad cap as well normally this old they won't hold pressure to long.