Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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Vibration noise My Mastercool vibrates at on low speed.

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Unbalanced mounting or unbalanced fan. check how it stands and make adjustments.

Posted on May 12, 2009

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Posted on Jan 02, 2017

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1 Answer

Mastercool has loud thump when blower comes on....


Are you sure the blower wheel is not loose on the shaft. There is a set screw to tighten it to the shaft. How are the bearings?

Jun 10, 2013 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

I noticed a smell coming from the mastercool and now the low speed and low cool does not work.


is it a burning rubber smell or a burning eletric smell. burning rubber smell will be a slipping belt. replace the belt and pullys. tighten belt. electic smell will be a bad thing. have tested by technition

Aug 12, 2010 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

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.

May 29, 2010 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

2005 Equinox: 2005 chevy equinox vibration at low speeds...


A low speed vibration is likely caused by a tire. Check to see if any rims are bent. Have the tires checked and replaced as necessary. If the tires are worn unevenly have an alignment done. If this is an AWD model check the driveshaft and support bearing.

May 18, 2010 | 2005 Chevrolet Equinox

1 Answer

Motor does not go from low speed to high speed If the motor is set to low speed it does not turn on until the high speed range is hit then it tries to go from stop to high speed and throws thw belt


MOST OF THE TIME IT IS THE DIGITAL THERMOSTAT OR LOOSE TERMINAL AT THERM. THESE STATS ARE TRICKY TO CHECK. LIKE WHITE ROGERS 4 WIRES CONTROL WITH A RED WIRE TO GREEN YOU GET PUMP WHITE YOU GET LOW YELLOW YOU GET HIGH AND SO FORTH. MASTER COOL DOES IT DIFFERENT SO YOU BUY THEIR TSTAT

Apr 21, 2010 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

My motor switches from high to low over and over again


It sound like the low speed winding in the motor is bad.You will need to get a new motor.

Jul 24, 2009 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

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.

May 30, 2009 | Cfm 2000 Swamp Air Cooler MMB10 MasterCool...

1 Answer

Mastercool air conditioner


If it is indeed a true vibration, it could be a number of things. I have seen bad bearings do this off and on as the cooler runs. Could be something going wrong with the blower motor. There are several things that need to be checked to properly evaluate the problem you are describing.

Aug 29, 2008 | Mastercool 67680 Evaporative Cooler Air...

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