I did mine on a 70 Chevelle, with A/C. So this relates to that year.
Disconnect battery (safety thing)
Remove almost all bolts holding Right inner fender well leaving one or 2 in the front loosely connected.
Pull fender well down and block it with piece of wood.
You should see motor, and there are 3 bolts to loosen. There is a 2 wire connect mouted to the motor as well as a cooling tube that redirects air back to cool the motor.
Anyway, I bought a new motor from local parts store for $20.00 or so.
When you get motor out, you might have a heck of a time clearing the squirl cage/motor assemble thru the space between fender and well.
Remove cage from old motor, and install it the same way on the new motor. Install in reverse of disassembly.
Check a few things before you jerk the motor. Make sure you are getting 12+ to hi speed relay on firewall (only for hi-speed), you can check to see if there is 12+ coming to fan switch, and that the switch is not intermittant like mine still is by wiggling it.
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