heater on 1990 Oldsmobile 98

my heater blows but doesnt get hot.

Asked by for the 1990 Oldsmobile 98
flush heater core
1 more answer
Check to see that rad is topped up,might need a thermostat,are there any fluid leaks,if so the rad will not hold pressure and wont make as much heat,did it just all of the sudden stop working or what?