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Q: Defroster and dashboard vents stopped putting out air on 2004 Buick LeSabre

There has been a knocking sound from under the dash when the fan is turned on. Then, the knocking stopped and so did the vents and defroster. Do I have to replace the blower or a module or is it just mechanical? Thanx...
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If the blower is not working at all, the first thing you should do is, with a light tester check to see if you have power going to the blower. If not,try replacing the blower relay/fuse. After you've replaced the relay/fuse, double check to see if you have power going to the blower once more. If you've taken these steps and the blower still is not functioning, it's obvious it must be replaced. Also, make sure all your vents under the dash are all connected together properly so that you get the full force of the blower to which ever setting you choose (defrost,vents,heat/ac). Good Luck...
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