85 GMC power window help needed asap

[68c10owner]

I need help from you guys. I just went and looked at a 85 GMC swb and my only issue with it is the power windows. The driver side is slow but works. Pass side Wil not work from the pass side switch and the brier side switch has to be flipped off and on a bunch of times to get it to work. If you hold the switch down it just stops. Since the a/c doesn't work and we are having 100+degree days I need the windows to at least roll down. I can get this truck for a smoking deal but since I have my kids in the truck I need some sort of air moving through the cab. I guess my question is, is this going be a expensive and time consuming project to get the windows working like they should? Is there a upgrade that would make them better than stock?