So from your voltage testing you think the new motor is powered up ok, but it doesn’t turn? hmmm … well, that pretty much means the motor itself is kaput, or that there’s something mechanically preventing it from turning, like the cage that it spins is stuck for some reason. Does the cage (the fan) come with the motor when you buy it? Or are you using the existing fan and bolting the motor to it? What I’d do in this situation is bench test the motor to see if it spins ok removed from the car when properly powered up. You’ll have to come up with some kind of power supply. A car battery would do it. I have a computer power supply I removed from a computer a neighbor was throwing away which I use for that kind of test. If it doesn’t turn on the bench there’s a chance there is something preventing the motor from turning once it is installed. That can cause the motor windings to burn out, ruining a new motor in just a few minutes of being powered up like that.
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