Check the rubber seals around your taillights, along with the seal on your rear hatch. Those are usually the main spots where water gets into your vehicle. If you have a rear spoiler, it's possible the water could be leaking thru the bolt holes where the spoiler bolts down to the hatch.
Anyhow, hope this helps...
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Weekend Mechanic for my Not-So-Mechanically-Inclined buddies....
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