Question about Dometic Rooftop RV Air Conditioner

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Replacing AC blower motor

I am trying to replace the AC blower motor on my trailer. I can not determine how to get the old blower out. Can someone help me?

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ITS CALLED SURGERY take picture as ya go and have a big bucket for screws. make sure you have your motor and capacitor tested first before you replace it unless you know its bad (hp,sf &rpm must match !!!! on new motor ) little guys are real expensive and are a three speed motor and must be hooked up right or you will burn it UP ! do this in the shade cuz it aint no fun in the hot sun(me Florida) the first thing i would do is oil the motor then have the capacitor checked , the motor may not need to be replaced just serviced ?.. hay now if'n i was any help write a review of thanks or just VOTE,, MOTORWIZJ ..FL

Posted on May 28, 2010

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I recently replaced the blower motor, blade fan, and blower wheel on my Dometic 57915 rooftop AC. Not a hard job if you are moderately mechanical. Look up the schematic diagram to see how everything goes together and know what part is what. First remove the shroud, condenser cover, and evaporator cover. This will provide access to the motor, blade fan, and blower wheel. Spray some PB Blaster on the motor shaft where the blade fan and blower wheel attach to make later removal easier. Loosen the screws which tighten the metal retainer rings which keep the fans mounted on the motor shaft. Remove the three nuts which mount the motor to the metal housing. Remove the 'foot' which support the bottom of the motor to the floor. The motor can now be pulled away from the metal housing which is around the blower wheel. The blower wheel will prevent you from completely removing the motor. With a small pry bar, using the metal of the motor as the fulcrum point, pry the motor away from the blower wheel/metal blower housing. The blower wheel will pop off and stay inside the housing. The motor is now free to remove except for the external wires. If you need to replace the blower wheel, loosen the 3 screws which hold the evaporator coil to the housing. The coil can now be moved slightly forward which will allow the old blower wheel to be removed and the new one inserted. Remove the blade fan by holding the blade fan next to the motor shaft, allow the motor shaft to hang vertical, tap the motor shaft on top allowing the weight of the motor to pull the shaft out. If you are replacing the motor and it came with a new capacitor, the instructions are wrong. Run the white jumper wire from the common terminal of the old capacitor, connect the other end of the white jumper to one (doesn't matter which one) of the terminals of the new capacitor, connect the white wire from the motor to this same terminal of the NEW capacitor (there will now be two white wires), connect the brown motor wire to the other terminal of the NEW capacitor. The run blower motor side of the OLD capacitor will not have any wires to it.

Posted on May 21, 2013


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