As I may have mentioned before, I get a rear deck rattle when playing music with lots of bass or when driving on bumpy roads. This happens at all temperatures.

With the car parked, the stereo on, and sitting in the back seat, I managed to trace the rattle (at least the stereo bass-induced rattle) to the battery vent. If I apply pressure at the top edge and rear base of the vent ("tipping" the whole thing backwards), the rattle goes away. I haven't found a way to non-destructively remove the vent assembly to insulate it so I've been trying to remove the entire rear deck trim assembly. Even with the service manual, it's taking awhile. So far, I have the 4 clips disengaged so that the assembly slides back and forth a bit but I haven't been able to pull it out. It seems to be hung up on something (the claws or maybe the seats).

I will resume my efforts later today or tomorrow.

If I get this fixed then I only have to deal with the windshield "clack" to get a rattle-free car.