Speeds 1-4 recently stopped working on my 2007 Trailblazer. Did some research and found that this is likely the problem. I used a 7mm socket and a 7/32" socket to remove the screws (4 total). I also recommend using a screwdriver to remove the connector from the fan motor. The existing resistor was found to be badly corroded, causing speeds 1-4 to not work. Replaced with this part which was exactly the same. Generally repair is easy and much cheaper than going to the dealer.
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