ok I've had this issue on various cabs over the years and this is what I found out can be the problem.
1. If you hood is old - it shrinks up on the front of the hood right above the top front of the doors and thus lets water drop down onto the top door rubbers - the water then runs on the top of the hood rubber and after a while it makes it way through the top of the rubber and runs alone the metal above the rubber until it finds a way of dipping into the car at the front of your door. No real fix for this if this the case, you need to replace your hood - They way u can tell is the hood should be a nice straight line from back to front of hood - covering the same amount of the hood rubbers - if you see more than 10-20cm at the front from the back of hood - you hood has skrink - time for replacement.
2. The upper hood rubber for the doors are worn and this lets water in alone the rubber - but mostly at the top front of the door.
3. The door rubber that goes around the door - at the very top at the front of the door - this part of the rubber wears alot, due to the door opening and closing and the rubber pressing into the top hood rubber and the top front car rubber above the wind screen. There is a little funnel design in the rubber to allow the water to drain from the hood - when this part of the rubber wears or goes - it lets the water straight into your car and looks like its coming from the top rubber or the hood.
Hood - £350.00-£500 - depends on who you use.
Door Rubbers £40.00 each -
http://www.gpcvwaudi.com/Top hood rubber - £45.00 each -
http://www.gpcvwaudi.com/Always good to clean your hood and door rubbers now and again so they are clean and smooth so water runs off them.
Hope this helps.
