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Flooded rear battery tray? 2007 XC90 3.2

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
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Flooded rear battery tray? 2007 XC90 3.2

Post by jerryv » Wed Jan 15, 2020 12:09 pm

I was working under the hood and the battery was disconnected so I didn't get around to closing my tilted-open sunroof through some extremely heavy rains this week. Knowing the sunroof drains on these vehicles frequently clog and flood the front floors, I checked the front floors a few times and they were dry. The car was parked slightly uphill.

When the time came to reconnect the battery, I found like 2" of standing water in the rear battery tray area. Pulling the battery overflow gasket drained the water in short order. I see some evidence of water coming out of the drivers 3rd row seatbelt slit.

Not finding much info online about this happening to any other owners and it's unclear if these XC90s even have a pair rear sunroof drains like some of the sedans have.

Can anyone confirm/deny the existence of rear drain tubes?

Could this water be coming in from a roof rack through hole?

I'm going to check/service the front drains anyway. Anyone try snaking the drain holes with wire or something?


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Re: Flooded rear battery tray? 2007 XC90 3.2

Post by oragex » Wed Jan 15, 2020 5:18 pm

You have rear drains as well. The tubes on the XC90 are quite larger than on the S60/V70, less probable to clog
Front ones I put a hose from the sunroof hole, rear holes ae not usually accessible from the sunroof so I would try the same but from the bottom where the tube exits and with a small jet at first and check inside the tray for water flowing - mind you, you'll probably need a larger tube

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