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I do not recommend you fill them or you could be causing an even bigger problem.
The method used to find out if there is flashing behind the brick depends on the type of weep hole they used. If they just left the head joints in the mortar open you can usually use a flash light. An even better way is to take a close up picture using a digital camera and flash. A third option is to probe with a piece of wire like a cut off coat hanger, but be careful not to puncture the flashing.
If they used a pre made plastic tube you will not be able to see the flashing but you may be able to probe for it. I most cases the flashing will be black vinyl or rubber, or asphalt impregnated fabric over copper.
The problem is that there is no way to tell if the flashing was installed properly without removing some brick. If the flashing has a hole in it, is too short, or is not damned up on the ends, you could have a problem.
Is there a metal drip cap over the window molding but underneath the brick? If there is (and there should be) it should be sealed to the wall sheathing behind the brick so even if the brick did leak it would prevent water from getting to the inside. This would be the first place I would suspect water problems.
I would suggest you make certain that all the other possible points of entry are sealed first. Then you may want to consider pursuing the flashing as a last resort.
[This message has been edited by seuhus (edited September 13, 2003).]
I will pull everything out of the weep holes.
Document this whoile process. You may need to further this calimn later