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Maybe there's a short somewhere in the electrical system. Or, that the speakers were installed incorrectly.

the answer is kinda weird but I have found this more than once. Apparently GM did not use good solder when securing the speaker voice coil to the leader wires (small braided wire that connects the terminals to the speaker cone). The solder melts because of high temperature and the wire separates. You may find that they work when it is warm outside sometimes. Anyway get rid of the crappy GM speakers and buy some new ones for the back deck. Your problem will be gone. I suggest maybe a very fine white grille fabric under the speaker grilles. This will reflect the heat in the summer. It probably wont happen with aftermarket cones but it never hurts to be cautious.
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Q: Why do the rear speakers on your 2000 Grand Prix only work some of the time?
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