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Wheel bearings shouldn't wear that quickly. Possibly not installed correctly or another problem. The vents sound like the resistor is bad. There should be a resistor that controls the blower motor. Misfire could be a fouled plug, bad cable, bad coil (requiring a new single coil or coil pack as it may be). You can check to see if that cylinder is getting spark, if no it's the coil. You may want to invest a little cash to a reputable garage. In my experience its worth avoiding the time, frustration, and hastle of tracking down problems. Good luck!
Well according to the wiring diagram, the blower relay gets power from two sources and feeds the fan switch. High speed bypasses the resistor and goes directly to the blower motor. The other speeds go thru the resistor and the motor is grounded. The AC control panel is connected thru the low speed which would include the other speeds also. The only thing I could think of would be a break in the wiring or one of the connectors. Did you check for voltage coming out of the switch for each speed, and then coming out of the resistor too ?
The blower is on the right hand side under the dash. You are right in thinking the blower resistor is the problem. The resistor is in the heater box behind the blower. Only 2 bolts hold it in but the back one can be a challenge to remove. The bolt is 5.5 mm.
Check for power and ground with a test light at the resistor connector. You should have power on the colored wires in the various switch positions. The black one is ground.
Test the blower motor by jumping 12 volts to the blower motor connector, if it works you have a defective blower motor speed control resistor which is located just next to the blower motor, i recommend u replace both as the blower motor ages it draws more current and this causes the resistor fail, u should be able to buy these parts in the aftermarket, the dealer parts will be very expensive.
The blower motor is behind the glove box. Remove the glove box (3screws, 1 on the left side and 2on the bottom). Remove the glove box lower frame (4 screws). The blower motor assembly will be on the right hand side under the dash