swamp cooler motor problem

[bearmd]

I am having a problem with my swamp cooler. Just this season, when the fan is on "high" (I only have 2 settings), it will all of the sudden slow down to low (for 5-30 seconds) and then speed back up again

to high. This has never happened before and I have lived in the house for 3 summers. I do the maintenance myself, but I didn't notice anything untoward when I was setting up the cooler this spring. It sounds like it might be the motor and/or bearings? But how do I find out? And is it easy to replace the motor? Thanks!!

[tom]

[Big Al]

Are you sure it not the belt slipping?

Al

[bearmd]

[Rick W Dye]

replying to bearmd, Rick W Dye wrote: Mine is doing the same thing please let me know if you find out what the cause is . I replaced the motor but it's still doing the same thing [e-mail]

[trader_4]

Put a volt meter on the motor and see what it reads when it does that. If there is a drop, then monitor the input voltage to the unit. Could be a voltage drop, could be a relay, could be the controller is hosing up and commanding it to low.