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Blower motor vibration in a/c unit

My Carrier a/c unit is vibrating enough to shake the house. I replaced the motor and it made no difference. How can I check if the wheel is in/out of balance? What else can cause this?

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There are thin weights that can be added to the fan blades much like you can add weights to a ceiling fan blade and balance it out. Real simple!

Posted on Aug 29, 2012

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You already checked to see if the blower wheel is out of balance by noticing that the a/c unit vibrates. There is nothing else that can vibrate that badly.

Go buy a new blower wheel.

Posted on Jul 22, 2008

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You really cant check for it out of balance. not to mention you will never get it back into balance. The best thing to do is to buy another blower. the vibration will cause other problems including causing freon leaks in the evaporator coil.

Posted on Aug 29, 2012

  • JTran Jul 29, 2013

    Remove the whole blower unit out and place on a flat surface with the wheel face up; then use the small fan to blow air to the fins. While the wheel and shaft rotating, you can see the wheel out of balance, the faster the more vibration. To re-balance the wheel, you need to place a small tab on the fins at certain location and weight. It requires your skills and time. Noise is just one of its problems. Running out of balance for a long run will damage the bearing of the motor too.

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