my BMW 3 Series E90/E91 has water pooling in the passenger footwell, what could it be?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface.
• Disconnect the battery if working near electrical components.

2. Inspect and Clear Sunroof Drains

• Tools Required: Flexible wire or drain cleaning tool, vacuum.
• Locate the sunroof drain openings (typically at the corners of the sunroof).
• Use a flexible wire to gently clear any blockages in the drains.
• Use a vacuum to remove any debris that may have accumulated.

3. Check and Replace Windshield Seal

• Tools Required: Trim removal tool, adhesive sealant.
• Inspect the entire perimeter of the windshield for gaps or damage.
• If damaged, carefully remove the old sealant using a trim removal tool.
• Clean the area and apply new adhesive sealant, ensuring a proper seal.

4. Examine Door Seals

• Tools Required: None.
• Inspect the rubber door seals for any cracks or damage.
• Replace any deteriorated seals with new ones to ensure proper closure.

5. Inspect Cabin Air Filter Housing

• Tools Required: Screwdriver set.
• Remove the cover of the cabin air filter housing.
• Check for proper sealing and any signs of water ingress.
• Replace the cover securely after inspection.

6. Clear A/C Drainage Tubes

• Tools Required: Compressed air or a small flexible brush.
• Locate the A/C drainage tube under the vehicle.
• Use compressed air to blow out any obstructions or clogs.
• Ensure the tube is securely connected and draining properly.