Join Date: Jan 2008
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Re: Sunroof leaking and water collecting in driver footwell
OK OK here we go, was not confident about uploading the photos, is a repeat post
I have had a 2000 Scenic and have been plagued with water ingress through the sunroofs front and rear since purchase. Water collected in the spare wheel housing and on the passenger front footwell. After weeks of investigation I removed the roof lining, you can see the stains in the corners where water comes in, mainly on the nearside because the car is parked leaning over that way.
I checked the drain tubes and they were fine though the rear were a bit kinked over a clip in front of the lights. I lived with drips coming in on top of me through the square holes adjacent to the mounting bolts while I tried in vain to discover how water was entering, I even removed the sunroof assembly and could see potential entry points but nothing I could confirm as a defect.
Eventually using a small mirror I could see how the water entered, see my sketch for the answer. The roof adjacent to the corners of the sunroofs has shallower downstands than the straight seams next to the corners and this together with the fact that water on the sunroofs always migrates to one of the corners. I had read about capillary attraction but never experienced it directly, the amazing thing is that with the drain tube removed about 60% of the water comes in through the hole adjacent to the bolt and about 40% down the drain tube, total about a cup full from the lowest corner of the sunroofs after a night of heavy rain, so I think that blaming blocked drain tubes are a bit of a side show as even if partially blocked the tubes would still drain the limited amount of water.
And the cure? Mastic (any sort) applied to the underside of the roof adjacent to the corners of the sunroofs (total 8) to seal the exposed seams. It was a relief to find no fault with the sunroofs as they are the best part of a grand from Renault and you have to fit it!
Currently in wyn burgess's garage:
2009 Clio 1.2 ST, 807 2.2, 1971 Triumph T25 T/B