What you will learn from Air Conditioning Blower Motor Repair article:

  1. Basics about blower motors and air conditioning blower motor repair
  2. How quickly can the repair be done?
  3. Specialty blower motors and costs
  4. Blower motor and related parts in the blower
  5. Why replacing the capacitor is important

Air Conditioning Blower Motor Repair

Air Conditioning Blower Motor Repair
Air Conditioning Blower Motor Repair Labor. Troubleshooting and repair of the air conditioner system time (approximate) 1.5 to 3 hours depending on unit location and part availability.

This is common in the summer. High heat and constant use causes old (and some new) air conditioner blower motors to burn up. There are several different types of air conditioner motors. When dealing with anything electrical the best replacement is an exact replacement. There is a contradiction to that phrase. If you have a shaded pole air conditioner blower motor in your air handler I recommend that it be replaced with a PSC motor. If you don’t know what that terminology means, the air conditioner technician should know.

PSC Motors and Efficiency

PSC motors are far more efficient for air handler blower motor applications than shaded pole motors. Shaded pole air conditioner motors are a rare find (at least for me). When they are found in air handlers they should be replaced with PSC motors. Additionally, when replacing any PSC motor I recommend replacing the capacitor.

Related Link: Learn more about electric motors used in HVAC - Take a closer look and learn more

If the air-handling unit is difficult to access it will take the technician more time to change the motor. Some motors can be carried on the truck but most have to be picked up from an HVAC parts supplier. There are companies with parts runners. Once the HVAC tech diagnoses the problem they call the parts runner. Sometimes, by the time the technician has the old motor pulled the parts runner has the new motor delivered.

Air Conditioning Blower Motor Repair - Specialty Motors

If your unit is equipped with a double shafted motor expect to pay up to $300.00 or more for a new motor. These double shafted motors are rare in residential units but they do exist. Out of about a hundred motors in 2001 I only had one that was double shafted.

no oil plugs on this motor which is variable speed

Variable Speed ECM Blower for Added Efficiency

Another medium ticket item for replacing is the ECM blower motor. Thisis variable speed and can be found on most high SEER units. Variable speed motors are more expensive than standard blower fan motors or condenser fan motors. However, they are more efficient than conventional PSC motors and have better although more sophisticated control. If you have a variable speed motor that is bad it is important to replace the motor with an exact replacement. Depending on the OEM of the equipment will depend on the cost of the part that needs to be replaced. Sometimes an aftermarket variable speed motor can be used. However, most brands have proprietary connections for the electrical. This requires an exact replacement is needed for repair when a bad variable speed fan motor is found.

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Air Conditioning Blower Motor Repair - The New Motor

Typically the air conditioner blower motor will be replaced with a stock blower motor from the HVAC supply store. Sometimes from a stock blower motor on the truck. The blower motor may not be the same brand but it is important. You should understand that the blower motor is matched for amp draw, horsepower, voltage, RPM, the diameter of the motor for remounting in existing bracket. Additionally, the motor direction, whether it be clockwise or counter-clockwise. There are blower motors which are reversible with a simple wiring change. The bracket which is in the existing unit may not be able to be reused. This will necessitate a new bracket that will mount the motor properly. It is important that all these things are done properly.

Related Link: Learn more about Variable Speed ECM Blower Motors - Take a closer look and learn more

Sometimes it also necessary to change the blower wheel. This is true if this wheel is damaged in any way or out of balance. The HVAC technician will be able to recognize all these things and offer quick efficient solutions. Parts are also the problem for the average consumer. Most HVAC supply houses or even OEM stores do not sell to the general public. There are many reasons for this but it is partly to encourage competent repairs by a skilled technician when the system fails.

Air Conditioning Blower Motor Repair - The Capacitor

As always, it is always recommended adding a new capacitor if the blower motor is replaced. Firstly you make sure the capacitor is properly rated for the new motor. Secondly, it only makes sense as capacitors are cheap compared to the cost of the motor. And finally, you will be reassured that the capacitor is good. Most capacitors are tested when they are cold. What happens when it gets hot while running. Is something breaking down when it is hot? Is the heat causing the capacitor not to work and putting extra strain on the motor? Again, even if the old capacitor tests are good always replace it with a new capacitor.

Lastly, other Resources to help you with Capacitors and HVAC Motors:

High Performance HVAC

Bad Air Conditioner Blower Motor

To learn more about heating systems and HVAC use this resource.

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