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Thanks for posting
does water collect on the floor only when it's raining or while washing the car or at dry conditions as well?
Thanks for the reply, they said that the water is not draining from inside the fender drain passages, this is usually because water enters the fresh air grill just in front of the windshield, normally the water drains out through drain passages one on each side, there is sort of a trough so fresh air can come in but no water, if the drains get clogged with debris like leaves the water can rise and drain into the air vents and in the passenger compartment, did they check for this or do they just want to sell you another car? I assume they did check the sunroof drains like they said but I somehow have some doubts maybe you should get another opinion besides the one I gave you.
Put the car as level as possible, take a garden hose and start running water into the fresh air intake grilles, you should see water draining out below on each side just in front of the front doors, if not the drains are clogged, let me know how that goes before taking anything apart.
Great, it's a pretty common issue with those sunroofs, thanks again for visiting the site.
In most cases the drain hose exits the firewall on the passenger side, you should be able to see it when the carpet is removed or pulled back. The evaporator housing will have the hose attached to it then it exits through the firewall.