Question about 2004 Chevrolet TrailBlazer

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A/C and heater raddle/vibration when fan control turned on

A/C and heater seems to work fine. However when fan control is turned on there is a raddle/vibration that is heard and felt. It gets worse as fan speed is increased. What might this be?

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That vibration is caused by something lying in the fan. This causes an imbalance in the fan that gives off the vibration. You will have to remove the blower motor in order to get to the fan and clear the fan of whatever is stuck in the fan.

Posted on Oct 06, 2009

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Posted on Jan 02, 2017

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