Plugged moon roof drains can cause a water leak inside the car. The water will usually leak onto the driver's or passenger's head when the car turns a corner.Google+
Car Problem Reports
Honda Accord Plugged Moon Roof Drains May Cause Water Leak
Honda Accord Problem
Average Mileage: 118,082 mi (30,000 mi - 267,836 mi)
Visitor, 2010 Honda Accord, 30,000 mi
Use a long nylon extension attached to a compressed air gun. There are 4 drain holes in the sun roof drip pan; 1 in easch position: The right & left front and the right & left rear. Open the sun roof. The fronts are easy to locate and blow clean. The rear drain ports you will need to "fish for" but are easy to locate & you will feel then the tip finds the openiing. Simply insert the blow gun nozel into the drain hole & blow for 5 seconds to remove debris covering the drain exits in the wheel wells.
Visitor, 2002 Honda Accord, 110,000 mi
The problem was: very wet floorboards in front (and possibly also rear) of the car. This produced a very bad odor that persisted for a long time. At first I thought it was a windshield problem. Rather, there was an issue with the sunroof (moonroof?) hose. Either it was disconnected or clogged. A local Honda dealership repaired it; took two visits, the first visit didn't quite "take."
When it rains the drivers side carpets front and back get
soaking wet? Sealing the windshield did not help?
Visitor, 1998 Honda Accord
Sunroof leaks on head while turning the corner
Visitor, 2002 Honda Accord, 48,000 mi
water in trunk under spare tire. source of leak found to be left and right trunk to quarter panel body seams. Resealed over factory seal with RTV type caulking. Also, checked and cleared moonroof drain connections to the wheel wells.
A year later found water in right rear passanger foot well. No clue yet where this is coming from.
Visitor, 2002 Honda Accord, 99,000 mi
Water in passenger back set when rainfall
Visitor, 2002 Honda Accord, 186,000 mi
Wet in driver's side floorboard ... no windshield leak. Continues to have a small puddle on drivers side after every rain.
Visitor, 2004 Honda Accord, 104,000 mi
My sunroof is still awesome!!! Just wanted to say for report #2 thats what she said!!!!
Visitor, 2000 Honda Accord, 170,000 mi
Water leaking on driver side, resulting in soaked floor mats. I blew out the drains on the moonroof and leaking stopped, but it has started again. I think I I'll use a compressed air nozzle this time. Not totally sure this is the final solution to the problem.
Visitor, 1998 Honda Accord, 100,000 mi
Water drains onto the floor of the front cabin.