heater/blower issues

i have been having an issue with heater, it blows hot air and blows fine for the first 15min and then get very low air flow from vents, but the fan seems to be blowing like normal. so i replaced the resistor and blower motor, after a week the blower totally quit. the resistor was bad, it keeps blowing the resistors, ever since i replaced the everything. have had electrical connections checked. just cant seem to figure out what is going on. i have searched fourm after forum trying to find the same issue with no luck

 

Sounds like you need a new blower motor. We just replaced my son's '08's blower. Found a replacement one on Amazon for just under $38 with prime. ​

 

Thanks pool guy I also replaced the blower motor, when I replaced the resistor

 

Sorry, I missed that you had replaced the blower also. Maybe test the blower separately. Hook power to just the blower, and see if its overheating and slowing down.