heatingproblem on 1990 Chevrolet Celebrity

the car has not turned for 10 years engine started well but then it get overheated thanks for reply

Asked by for the 1990 Chevrolet Celebrity
Make sure there is coolant in the engine and the thermostat is operating properly. How long does it take to overheat?
about 20 minutes there is coolant

Hi I have a chevy 1987 celebrity , the heater works well, just the fan makes noise when I turn it on, sometimes the noise goes off but then it goes on again? What can be the problem, is it expensive to fix? Or can I fix it by myself somehow?