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I would think that the bearings are going out in your blower motor. This motor runs any time the switch is on and as the bearing warms up the noise may go away but it will gradually get worse. I hope this helps you. Mark i bet its the blower vent door. try moving the lever to open and close it repeatedly before you start up the next time. tweek

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2006-04-04 23:29:57
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Q: What causes a thumping coming from the blower housing on a 1993 Chevy Silverado when the ignition switch is turned on or turn off it lasts for about 30 seconds?
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