Front and rear fan motors only work on high setting

Usually this means the blower motor resistor has failed and its available at Napa for around $20 here's what the front one looks like https://partimages.genpt.com/largeimages/921022.jpg and the rear one is about $24 https://partimages.genpt.com/largeimages/819159.jpg and the labor according to my book is 3/4 of an hour for the front and 3.6 hours for the rear