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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.If you can tell me the year, make of your Volvo I will have a look at the data files on this type of problem and see if I can come up with any known issues. Post back with complete information when you can and we can work from there.
There is one service bulletin from Volvo dealing with several issues with the sun roof. See it in the link below. Have a look at it and see if all of these things have been checked when the drains where cleaned. Copy and paste the link to your browser to open and view it.https://dl.dropboxusercontent.com/u/104923897/Sun%20roof%20Jun%209.pdf