If you cannot re create the leak problem inspect the interior of the door for stains or.
Sliding door leaking from top.
When a door leaks the most common suspect is the bottom corner of the unit.
Once you ve exposed the top sides and bottom of the door you can assess what needs to be done to make the door waterproof.
Leak comes from the top of the door frame and going down on side frame to the bottom inside the frame and drip at the same time a bit from the top of sliding door on the glass.
How to fix a sliding glass door leak.
A sliding glass door is no better than the frame into which it is placed.
Occasionally these sliding doors leak and need to be repaired.
If the door was installed directly on the concrete slab water could be seeping under the doorframe.
Leak happen when it is a heavy rain with wind blows same direction where is the door.
Above the door is a window new last year installed.
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Have a reputable sliding door contractor remove the door if it has not been damaged build a new frame and reinstall the door.
However in some instances the top corner of the door is the true culprit.
Spray the door and look for the leak location.
I resealed all the bricks.
Whether your door is sagging or bowed or just not making proper contact with the weatherstrip to seal out air and water the upper corners of your frame could be the problem.
If the door is installed at the edge of the roof overhang water could be leaking from the top of the sliding glass doors.
If a frame is crooked water can leak into the gaps between door and frame.
Aim a garden water hose with a sprayer set on mist or low at the outside of the sliding door.
Damage to the door itself.