1989 Chevrolet S10 Blazer Blower Keeps Blowing Fuses

You may have a electrical short in the power line leading from the fuse box to the blower motor. When you unhook it, no juice is being drawn through it and it will not blow. Make sure the correct motor is in it and it is wired according to how your car is set up to be wired. A short or large draw will pop a fuse. If possible, run a new wire and make sure it is heavy enough to run the amps needed. Too small a wire will heat up and draw more current than is designed for and pop fuses if it doesn't catch fire first. The fact you have blown two or three motors means either your getting a batch of bad motors, (Yes this can and does happen) or the wiring is not correct, or a short in the line is causing the problem.

For me, even $23 is "expensive" when it may not even be a necessary expense. Indeed, I may have gotten a blower motor with a lifetime warranty before. But there's no way I can find that receipt... Looking online, blower motors for my make and model can cost way upwards of $40 (not including s/h)! Did they stop manufacturing them or something?! Thanks for the tips. I'll give them a try. And I'll start with checking the resistor, as that sounds easy. As I said, though, while I've had to replace the blower on this a couple times before, it was over the course of several years. You mentioned making sure that the blower still has the ground on it. Now that I think about it, the last time I replaced the blower the screw/bolt which held the ground stripped the threads. (I didn't think I overtightened. It was cheap materials and it probably wore from having to replace several times.) To compensate, I had to use a different bolt hole for the ground wire. And I used a file on the metal ear to make good contact. But now, I wonder... Would a poor, intermittent ground contact cause the fuse to blow?