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#1
12-21-2003, 01:26 AM
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defrost thump ??
I have a 2003 Silverado, extended cab Z71. When put the dial on the defrost symbol and run it at speed 1 or higher, I get a slight "thump" every 35-40 seconds. Is this normal? Could it just be the compressor??
Anyone have the same noise ? 
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