How To Replace a Capacitor on a Swamp Cooler Motor

By | June 4, 2021

How To Replace a Capacitor on a Swamp Cooler Motor
Replacing a capacitor on a swamp cooler motor fall in the DIY category and is a straightforward fix.

Of course, if in doubt be sure to call a professional.

Not all evaporative coolers use capacitors, and it can vary from unit-to-unit if one is installed.

If the motor has been replaced the capacitor should also always be replaced.

A capacitor is a low-cost item that can cause problems for a new motor, and it is recommended to always replace the capacitor when a new motor is installed.

What is a Swamp Cooler Motor Capacitor?
A swamp cooler motor capacitor helps to regulate the flow of electricity to the motor with no heavy up and down spikes.

This can help to extend the life of the motor and keep it running at a steady rotation.

Some capacitors are called a RUN capacitor which helps a motor to start.
How To Replace a Capacitor on a Swamp Cooler Motor Test
Testing it can be done with the correct multi-meter which can test Micro Farads.

Many swamp coolers do not use a capacitor with it depending on the manufactures if one is installed or not.

How To Buy a Swamp Cooler Motor Capacitor
The capacitor voltage and amps need to match the blower motor with both having a face-plate for the voltage and amps.

Capacitors are measured in voltage and uf (micro farads). To find a replacement look at the capacitor and write down the voltage and the uf (micro farads) and then order a replacement.
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Capacitors shape can be oval or round which only matters when installing it. Often rounds are used to replace oval capacitors if that is all that’s available.

The tag on the motor will also show the horsepower, RPM, Voltage, and amps.
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The voltage and amps on the motor will match the capacitor.

Example Motor Capacitor on Amazon
PowerWell 5 uf MFD 370 or 440 VAC Oval Run Capacitor PW-5 for Fan Motor Blower Condenser in Air Handler Straight Cool or Heat Pump Air Conditioner – Guaranteed to Last 5 Years

How To Replace a Capacitor on a Swamp Cooler Motor

  1. Turn off all power to the unit and unplug it.
  2. Locate the capacitor and discharge any voltage it may hold by jumpering the legs together.
  3. How To Replace a Capacitor on a Swamp Cooler Motor Step 2

  4. Remove the wires.
  5. How To Replace a Capacitor on a Swamp Cooler Motor Step 3

  6. Remove the screws holing it in place.
  7. How To Replace a Capacitor on a Swamp Cooler Motor Step 4

  8. Connect the wires to the new capacitor.
  9. How To Replace a Capacitor on a Swamp Cooler Motor Step 5

  10. Reattach the screws that hold the capacitor in place.
  11. How To Replace a Capacitor on a Swamp Cooler Motor

  12. Test the unit which should now work

Summery
Replacing a capacitor on an evaporative cooler can be done by the handy homeowner who has some electrical experience.

If you work on the unit, be sure the power is turned off and unplugged from the cooler.

Capacitors have only two legs and two wires which make them easy to replace.

Be sure to order the correct capacitors for your cooler as there are many and it must match the coolers motor.

Have you replaced a capacitor on a swamp cooler? Let us know your thoughts below.

 




 

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