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Mastercool has power but belt won't turn - Mastercool Heating & Cooling

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Dry pad

Check for plugged holes in the top water distribution tray where the water from the pump exits to wet the pads.

May 04, 2017 | Mastercool 67680 Evaporative Cooler Air...

2 Answers

Pulleys not working

More than likely the pulley set screw is lose. Look on the inner hub of the pulley's both on the motor and the fan for a threaded hole with an allen head type of screw in it. Before you 'help' it to turn, look to see if one shaft of the other is spinning inside the pulley without the pulley itself turning. Buy a set of allen wrenches and tighten the screw. You may have to remove the belt to see the setscrew hole. It can be done by stretching it over the edge of the larger pulley and rotating it by hand. Put it back the same way. BTW make sure the power is OFF! fingers are still at a premium.

May 05, 2008 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

All was replaced last year pump,filter,belt,but nothing is wanting to fire up

Is the circuit breaker turned on? Is there power at the controler or control box? Is there a blown fuse in the unit? Is it remote controlled or on a lead through the wall?

Apr 02, 2011 | Mastercool 67471 Evaporative Cooler Air...

1 Answer

I believe I need to replace the motor. My cooler started making a loud noise and then just shut off and now it won't turn on at all. I'm new to this and have to do it myself but I'm having trouble finding...

There is not much to it, to access the belt/motor, remove side panels, loosen motor base bolts and push motor inwards to relieve pressure on belt. (you have to do this even if the belt broke off in order to install the new one), remove old belt and install new one. Slide/Pull back to tense belt. Proper tension is achieved when push belt with your finger between pulleys and the deflection is about 1/2"
Good Luck!!! Don't forget to rate this post!!!

Aug 15, 2010 | 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

When the wind blows my motor stalls and blows the breaker. Please reply slowly as my english in not so good.

The horse power of the motor is either to small or you can also adjust the motor pulley, loosen the allen set screw on the motor pulley, turn it in one or two full turns. The readjust the belt, there will be less airflow, but the amprege draw on the motor will be reduced.
Have a great day.
Paul Gibson

Apr 30, 2010 | Mastercool 67471 Evaporative Cooler Air...

1 Answer

Mastercool pump runs when themostat is off.

Check the compressor relay (in the outside unit) Most likely it's stuck.

Sep 12, 2009 | Mastercool 67680 Evaporative Cooler Air...

2 Answers

MasterCool 2 took a dive

Did you look at the unit. Maybe the belt broke or came off. Do you have voltage to motor. Need to follow the power to know where the problem is. Verify the breakers is good and there is power to the swamp cooler.

A frozen motor would not stop the pump from working. But the motor could have blown the breaker. Start by checking to make sure the power is good to the unit.

Aug 20, 2009 | Mastercool 67680 Evaporative Cooler Air...

2 Answers


If it was not drained for winter, do so and then remove all scale from the pan, pump inlet screen, etc. Replace the pads if they are scaled up and remove any scale from the louvered panels. WITH THE POWER OFF, check the belt for cracking and check to drive motor and blower wheel bearings for smooth operation, oil bearings with oil ports. With clean water in the sump, a good drive belt, clean pump screen and clean pads, the unit is ready to power up and run test the float action/shut-off, water distribution through the arms, belt tension (just enough to prevent slipping). These units work best when they can fully evaporate the water, so let the air flow out as fast as it come into the cooled space to maximize the evaporative effect. Also note, these unit must be level to work properly.

Apr 27, 2008 | Mastercool 67680 Evaporative Cooler Air...

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