I've tried one from Autozone and one from Advance. Both have the same problem, they never stop running. Even at highway speeds when it's 20* outside, they are still running. Well, the advance one would shut off once I went over 70MPH. But I swapped it out for an autozone one and that one only shuts off if I rev the engine to 3000 RPM while going 70 and then as soon as I go slower than 55 it engages again. Do I just need to suck it up and get one from Rockauto? Is the AC Delco the proper OEM part? Tired of the sucky gas mileage.