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Last night, we had a really bad storm. Today on the way to get my CV Axle replaced, I noticed that I could hear wind coming in through the back-passenger side quarter glass. After I got home, I climbed into the back to investigate, and I saw water was coming in where the red “X” is marked, and flowing down the blue line into my rear-passenger seat. The seat is definitely damp, but not completely soaked, so I suppose it is a slow leak considering it came down really hard.

I’m fairly sure it’s the quarter glass that is leaking, but I don’t know for sure, and I don’t know how to fix it either despite looking online for quarter glass DIY weather-proofing materials. I’m currently on unemployment thanks to COVID and I just spent the last of my not-so-expendable income on my CV Axle, so I’m really at a loss and feeling especially defeated right now.

As always, any help that anyone could give would be greatly appreciated. I could really use a bit of kindness right now.

EDIT: I took it to my mechanic, and he says the leak is likely coming from somewhere up higher. He tested the quarter window and said he couldn’t find a leak in it, but he’s not a window or body guy so he could be wrong.

 
Rep Power: 229

Ya I'd say rear quarter or possibly a sunroof vent tube, if you have a sunroof.

 
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Sadly, I don’t have a sunroof, otherwise that would be fixable for me because I’ve had that problem before. However, upon inspection of both sides of my car comparing the seals/weather strips around my doors and quarter windows, I noticed that the vertical seal that runs down from the apex of the quarter glass between the door and the quarter glass is set a bit lower than the on the driver’s side. It’s low enough that I can see an open, downward sloping channel that runs behind the quarter glass just behind the seal on the topside of the glass, whereas on the driver’s side the vertical seal is high enough that my car would have to be parked leaning to the left at a relatively steep angle for rain to be able to get into it. The vertical weather strip is hollow so water can run through it, but it isn’t blocking the open channel on the passenger side the way it is on the driver’s side. It’s maybe a difference of about 1/8 to 1/4in lower set on the leaky side.

I strongly suspect that’s where my issue lies, but I don’t know if that channel behind the seal leads to a drainage point somewhere, or if water would trickle into my car. To me, it makes the most sense that that would be the culprit because, despite a torrential downpour all night long, where ever the leak is only leads to a small amount of water leaving the seat damp, not soaking, from a trail of water so thin that I had to really look at it to know what I was seeing. I sealed up the channel with some Permatex silicone adhesive just to be safe, but if you or anyone else has any insight on that I would be really grateful.

 
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It turned out to be a hairline crack about an inch long underneath the weatherstrip on the roof near the upper-right corner of my back glass. I knew that line was there, but it looked like someone scraped the paint a little bit with the tip of a sewing needle (not exaggerating on the slightest) so I wrote it off as an insignificant cosmetic defect.

The guy that was about to replace my back window noticed and told me he was 99.99% sure that it was the source of my leak, and after drenching my car with a hose I found he was right. No more leak. He could have easily sealed the crack and still replaced my window and charged me $200, but he was an honest man and just sealed the crack and sent me on my way. Didn’t even charge me. I’m going to get cash and go back and tip him for saving me so much stress.

 
Rep Power: 222

Glad you got it figured out coffee and doughnuts are always acceptable. Make sure you recommend them to your family and friends