evap aircon dodgey?? keeps surging. how to fix??

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i have an ezycool evaporative airconditioner in the house i just moved into, when i have it on the fan speed keeps changing on its own going up and down every so often. many times per hour from almost a stop to flat out and all over again.
http://www.coolbreeze.com.au/ezycool.htm
anyone got any idea as to why this would happen??


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