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Blower Motor Resistor Pack defective. You can order the part from Rockauto.com. Lookup the part number on their website. There maybe two different part numbers one is with center counsel and one is without center counsel. GM direct wants 3 times as much for the part. They don't want you to do it yourself, so they charge what the dealer would charge for the part and labor.

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Q: Your 2003 Chevy silverado heater blower quit working on speeds123 it only works 45 whats the problem?
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Well you got ten years out of it. Put in a new one. Fuse??? Take a test light and see if there is power to the blower. Had this problem on my 1998 silverado with blower working on only high speed. Replaced the resistor, relay, and motor. Didn't help. Finally decided to use a test light to check for power. Started at connection supplying power to the blower motor switch then checked for power at each blower switch speed connector. Bingo! Bad switch. www.napaonline.com/masterpages/NOLMaster.aspx?PageId=470&LineCode=ECH&PartNumber=HC1...


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