Why is there water in the spare tire well of my Volvo V90 Cross Country?

Short answer: Owners trace it to the panoramic roof: a seal that shrinks and leaves a gap, or drain tubes that shrink, even when the drains seem to flow. Dealer quotes for drain tubes ran about $1,000 to $1,500. Dry it out quickly, because the 12V battery and electronics live back there.

Symptom: Water collects in the spare tire well or around the battery on the rear side panel, often after rain or a car wash.

What to check first

1. Vacuum out the water and dry the area.
2. Check that the rear drain tubes are attached and not shrunk.
3. Pour a little water into each roof drain corner and watch where it comes out.
4. Inspect the panoramic roof seal, especially where the ends meet.
5. Check tailgate and taillight seals.
6. Look for corrosion on the battery and nearby connectors.

Likely causes

1. Shrunken panoramic roof seal. Owners say the seal around the panoramic roof shrinks and leaves a gap where its ends meet. One reply said Volvo's tech guidance is to glue the seal ends, but others said it can shrink again.
2. Rear sunroof drain lines shrunk. The sunroof has small drain tubes that run down the pillars. One dealer said an owner's drain lines had shrunk, even though water poured into the drains still flowed out under the car.
3. Clogged drains. Leaves and dirt can block drains, so water overflows inside.
4. Tailgate or taillight seals. Water can also enter around the tailgate or taillight seals. A hose test shows where.

What it usually costs

Owners got dealer quotes of about $1,000 (XC90 drains) and about $1,500 (V90 CC shrunken drain lines). Gluing the seal ends is cheap, but owners say it may not last.

Is it safe to keep driving?

Yes for now, but dry it out soon. Water around the 12V battery and modules can cause electrical problems.

DIY or shop?

Drain cleaning and seal checks are DIY. Replacing drain tubes inside the pillars means removing trim and the headliner, so it's usually shop work.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists 10 recalls for these model years. None is about water leaks into the cargo area. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect. It covers the V90 and V90 Cross Country, and NHTSA returned no complaint data for some years.
• NHTSA complaints: 2 keyword-matched complaints for Volvo V90 and V90 Cross Country 2017–2024 (of 17 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-02; keywords: water, leak, wet, sunroof, drain, spare) (NHTSA returned no data for 2 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 2018 V90 CC water in spare tire well and battery area on Reddit r/Volvo, a 2018 V90 CC owner found about an inch of water in the spare well and battery area, even though the rear sunroof drains were attached and drained when tested. They spotted a gap in the panoramic roof seal. Replies called the gap a known seal shrinkage problem, said Volvo's tech guidance is to glue the seal ends, and noted it can shrink again. An XC90 owner said their dealer wanted about $1,000 to replace the drains, not counting the seal.
• In 2018 Volvo V90 CC water leak on Reddit r/Volvo, a 2018 V90 CC owner had water coming in high on the driver's side rear panel where the battery sits, collecting in the spare well and under the battery. All four drains flowed freely when tested, but the Volvo dealer said the drain lines had shrunk and wanted about $1,500 to replace them.

Quick tip

Find the source with a slow water test before paying for big work. A seal gap is a much smaller job than new drain tubes.

Vehicle focus: Volvo V90 Cross Country, 2017-2024.

Safety / mechanic note

Water around electrical parts can cause shorts. Disconnect the 12V before working near wet connectors. Verify with a mechanic.