blower motor problems

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You can turn the heat on and it works fine after a couple minutes the blower motor gradually starts slowing down until it quits blow heat, you can have it on high speed, and its very blowing out heat, you can hear the blower motor like winding because its varily turning, turn it off for a few minutes, turn it back on and the process repeats itself, sometime you can hear the blower pickup speed then slow down, gets faster slows down until there hardly isnt anything blowning out. ty