I would suspect you may have a problem with the window motor on you Chevrolet S10 Blazer. The window motors are equipped with circuit breakers which open and stop the motor when there is a problem. If most cases the window will roll down a bit and stop, after the motor cools down the window will roll down a bit more and stop again. If there a no obstructions in the window guides or binding of the window regulator the the motor is most likely at fault. Changing window motors can be a bit tricky and in some cases dangerous as the window regulators are spring loaded and can release the spring tension when the motor is removed. You may wish to let someone who knows how replace your window motor if that turns out to be the problem.