Not sure about the 1999, but in my 2003, they begin in the front corners of the sun roof. On a dry day, open the roof, pour some water in the drain trough, and watch where it drips onto the ground. Mine exits at the base of the front door post on the passenger side, and at the base of the centre door post on the driver's side. Maybe the other two posts have drains as well, which may be plugged. I'm still checking this out. Someone suggested blowing them out with air, or using a thin, flexible reamer, which I haven't tried yet. BR
where are the drain holes on the rear part of the sunroof and how do i clear them
How do you clear drain and tubes in the sunroof on a 2001 new volkwagen beetle?
Open the sunroof and find the four drain holes. Clear any debris. Blow air inside the drain tubes to find out if there is any blockage. Slide the replacement tubing inside the drain hose.
Make sure drain tubes are clear so water can run out
A bottle brush is perfect for cleaning sunroof drain holes on the Ford Escape. The smaller tip on a two-tip bottle brush can be inserted and then pulled out to clean sunroof drain holes.
Remove the celling apolstry and going down the right and left front windshield supports are a set of clear drainage hoses for the sunroof.
There are four drains on the factory sunroof. Two in the front corner and two in the rear corners. The front two are the easiest to get to. If you have access to compressed air take a blower with and extended tip and blow air in the front drain holes. Make sure you clear any debris that may have fallen inside your drain channel. The rear two will be able to be cleared if you have access to a piece of 3\8 clear tubbing you can attach to your air blower and repeat the same process as you did for the front. If all fails take it to an aftermarket sunroof company in your area.
the drain plugs are at the front part of the sunroof you will have to take the sunroof out to see them
I found the answer here: http://www.mazdaforum.com/forum/mazda-mx-3-mazda-mx-6-25/water-leak-17642/
One at each of the four corners.
On a 2006 there are is one at each corner at the front of the sunroof. If you open the sunroof and stand in the back floor board with the front seats pushed forward you can see them with a flashlight. Use a thin wire or a thin weed eater string to push through it. I rinsed it ours with isopropyl alcohol and used low pressure air to clear it.
A common problem with the 2000 Toyota Camry is sunroof drain clogs and leaks. These can be repaired through the dealership.