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first i would try checking relays,fuses, and the ground cables. replace as neccesary....now for checking the ground cables.....i would disconnect them and try scuffing them up with a wirebrush or something that will scuff up the metal a little bit then re-attach them.....test the blower and see if it works.....let me know what happened.
Sounds to me the blower motor is on it's way out and should be replaced. Even though they sound like there working doesn't mean everything is ok with it there are different parts on it that could go wrong and they way to fix it is with another blower fan and not a bad idea to do the resistor at the same time located in the blower box with about 4 wires coming out of it with one or two screws holding it in place all is located under dash behind the glove box area.
ok, missed the part about the rear ac working, the part that causes this is called the air temperature control blend door actuator motor, it is an electric motor driven gear drive that moves the plastic door inside the air ducking to mix or shut off the hot or cold air from the ac evaporator core or the heater core, you will need to replace it.