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Q: AC/Heater Blower on 2003 GMC Safari

My blower fan for the AC/Heater will work, and then it cuts out for a day or two, and then comes back on again. This has happened 3-4 times in the last couple weeks. Any idea's of what may cause this? I just had a new blower put in last March. Thank you!
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It could possibly be the blower motor resistor, which mounts to the front of the blower housing with 2 screws and 2 connectors and is an easy replaceable part.
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