Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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We have a mastercool swamp cooler model #mc63c and the low speed has never worked only the high speed. We're trying to determine if we need a different motor or a new control box.thanks randy

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Posted on Jan 02, 2017

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boysor2933
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SOURCE: Frequent short cycles of the Mastercool swamp cooler

Try to replace the thermostat. Short cycling of motor only happens when the thermostat is set to a very high temperature.

Posted on May 27, 2009

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co7196
  • 3433 Answers

SOURCE: Remove the front and rear panels off of a MasterCool P12

Lift yhe panel and pull out at bottom. The ones that come out usually have hand slots

Posted on Jun 09, 2009

  • 4 Answers

SOURCE: I have a Mastercool 2 speed 1Hp 220 volt cooler

Go manual turn switch, sounds like an overload problem. I have a Mastercool unit and going on 12 years with same motor.

Posted on May 10, 2010

  • 587 Answers

SOURCE: high speed does not work but low speed does

If your motor only works on low speed and not on high speed first check to see if you have the proper voltage to high speed. Check with a voltmeter or multimeter, check from common on the motor to high speed on the motor at the switch. If you have the proper voltage then you have an open winding on high speed and the motor needs replaced. If you don’t have the proper voltage or any volts, then the switch is bad and needs replaced. This also will be the same if, medium speed won’t work and low speed does.

Posted on May 30, 2010

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  • 1 Answer

SOURCE: I have a Mastercool Evaporative cooler and had the

Several of us add scented fabric softener at start-up each year, and later add a bar of ivory soap. I also have an in-line 'scale eliminator' and an anode inside , as well as a purge pump, which changes out all the water every 8-12 hours. These things combine to keep fresh water in the cooler, and suspend minerals. With clean pads, that should keep foul smells away.

Posted on Jul 04, 2010

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High speed does not work but low speed does. Is there an easy fix, or will this require a motor replacement to get both speeds working again? The cooler is a Mastercool model MC64C


If your motor only works on low speed and not on high speed first check to see if you have the proper voltage to high speed. Check with a voltmeter or multimeter, check from common on the motor to high speed on the motor at the switch. If you have the proper voltage then you have an open winding on high speed and the motor needs replaced. If you don’t have the proper voltage or any volts, then the switch is bad and needs replaced. This also will be the same if, medium speed won’t work and low speed does.

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Remove the front and rear panels off of a MasterCool P12


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No low speed on my mobile master cooler module no mmb12c


Could be as simple as the switch, could be as complex as a pole burned out on the motor. If you reverse the connections on the speed selector switch and you end up with low speed and no high speed then you know it's just an inexpensive switch.

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3 Answers

Frequent short cycles of the Mastercool swamp cooler


Short cycling can also occur in a thermally protected motor if it is overheating. If the other solution did not work, make sure the belt on the motor is not too tight or too loose. A handy person can check the amperage with an amp probe to make sure it is in limits. The adjust the pulley to put it into specs.

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