Shouldn't CAUSE any leaks, it may contribut the existing ones, but not cause any. The rain will just not be direction away from the windows and door seams like they would with the gutter. If all the rubber is new and all the seals around the windows (windsheild) is sealed corectly you'll be fine, although opening a window a little during a rain will be a no no and after a rain opening your doors might get you a bit wet due to standing water, but other than that your pretty much safe.
HK
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