We have a hvac Nordyne model P3RA-048K
Everything is working and there is cool air coming out of vents but the blower is tuning to slow so very little air forced out.
Either the filter is clogged and needs to be repaced.Or check the coil inside the unit and see if it is getting iced up.You can try shutting the unit down for an hour or raising the temp.If this helps the motor speed then you know the coil was iced up.
It is also possible the motor may be going bad,doubtfull though since they will run for a while then shut off.
Check your filter
Check for ice
Possibly clean the inside coil.