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I have had so many issues with different cars and their fan relay systems. It is quite annoying to troubleshoot. I currently have an 02 Focus that the low speed won't ever come on. I have to have the AC on all the time to make the fan run. I had the same issue as you with a Cavalier back in the day, took me a while to figure it out, but if you follow the schematic, you should be able to sort out where the issue is. It isn't near as complicated as my Focus.
Just start at the "hot" wire and follow it to the fan.
 
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