Attic? Do you have a finished flat ceiling?
Or do you just mean the peaked part of the roof, the portion above the walls?
But to answer your question, yes, roof venting wont do much unless there is a source of incoming air at ground level. Normally most garages aren't sealed up airtight as air can still get in around the main door for the most part.
Any garage is going to feel humid shortly after you park a hot wet car in there but it should clear within a few hours.
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