The problem is that not much air flows.
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I agree with about needing to fix the t-bar seals but I haven't managed to track down exactly where the leak is and don't fancy spending
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'x' hundred pounds on new seals until I know for sure it is them.
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The leak is made harder to find because when it's raining some times there is no leak, other times its leaks enough to saturate seats, carpet and me if I'm sat in the car!