How to repair a leaking windshield on a Volvo S80.

Let's see how to diagnose and repair the water leak from the windshield of a Volvo S80: this is a common defect across all Volvo P3 models (S80/V70/XC70/V60/S60/XC60) caused by the adhesive used to bond the windshield, which degrades over time, especially at the top, creating a micro-crack.

As a result, water enters the cabin, particularly on the right side, soaking mats and carpet, and causing a musty smell.

Let's look closely along the perimeter of the windshield, checking for bubbles or cloudy areas in the adhesive. Then, with the help of a friend, spray water section by section on the windshield and roof (a watering can will suffice).

Obviously, the definitive solution is to replace the windshield, but that is an expensive operation. If the windshield does not have cracks, we can try to improve the seal of the adhesive by thoroughly degreasing the area where the leak occurs and trying a specific adhesive like 3M Urethane Windshield Adhesive, which is definitely the best product: it can be found on Amazon USA with the code B000RW1XCK for $19.99 plus $10.22 for shipping.

Clean the crack thoroughly with alcohol, gently insert the nozzle of the gun into the crack, and slowly inject the adhesive, trying to fill the entire void. Level it with a spatula and clean up any excess.

Do not wet for at least 48 hours. We can also contact Volvo: in some markets, the defect has been acknowledged, but if the glass breaks during the repair, we will have to pay for it ourselves.

What the YouTuber also recommends is not to use common silicone or non-specific sealants.