Water collects on both sides of the track where the sliding part of the door sits and where it slides.
Sliding patio door track fills with water.
If the sliding glass door is placed directly on a pre existing concrete slab with no recessed area in which the door track can lay water can penetrate the home s interior flooring through the bottom of the threshold if there is a breach in old caulking.
Look for dirt or debris that could be clogging these holes.
Water can seep through even the smallest cracks.
Check to see which door moves and which one is the stationary.
This is a three panel horizontal sliding window.
If you have a problem with water leaking it will usually be on the bottom track threshold of the non stationary door.
There s a trio of aligned holes on the track rails.
Sliding door sliding patio doors are the solution sliding panel travels on a hardened stainless steel track cover for ek366 glass options along with argon or krypton gas fills are options k366 that you will want to discuss with your window representative.
I am adding a photo of the window tracks.
Last night we had heavy winds with the rain which blew it against the door and the tracks filled to overflowing quickly even though the rain wasn t all that heavy.
To slide the heavy doors along the metal frames the doors use metal or plastic rollers.
The weep holes seem present and unblocked.
These holes are normally in the outside corners of the tracks.
Damage to the door itself.
It is likely that one or both of these weep holes are clogged.
The track on the sliding glass door should have a weep hole drain hole on each end to drain the water out of the track.
The water seems to be filling the window tracks then entering.