the water pump is good, antifreeze is good. but after i drive for a few minutes it overheats no warm air coming from the heater. is the thermostat stuck or could this be a heat sensor bad?
overheating on 1992 Mercury Cougar
It is most likely to be the thermostat, but could be a sensor. You could try the thermostat first. It may be best to confirm with a professional diagnosis before replacing parts.