I had this problem once with a different vehicle. You may check the heater control. That may be the problem. Hope this helps.
im having the same problem with my 1994 I've replaced the heater core,thermostat,radiator,i checked the coolant, and it's not over heating or nothing and still no heat lol
Where is the vacuum pump for the heater located in a 1995 Ford F-250 Diesel? Ihave already changed the thermostat and the antifreeze, checked the heater switch and still no heat! Help
Have you flushed the heater core?
Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
You might have bad actuator that opens and closes airways.
First check the water level. Low level will not get to the heater core. Change the thermostat. If you recently changed the thermostat, bleed the coolant system.
What temp. thermostat did you put in? Try a higher temp. one. or check to see if heater core is clogged
Have you checked your thermostat?
sounds like you need a new control switch or condenser
Assuming you have checked the water and its topped up, could be thermostat blocked.
you may want to have the heating core checked!!it might be clogged up and not letting any hot water passing thru.
how do you get to it