Seriously, this has been an ongoing issue but this is ridiculous. where to start to fix this water leak on passengers side floor. are there holes that could be clogged? if so where are they and how to unclog? cabin filter is another option that could be causing this, I'm not the most mechanically inclined but at this point this needs fixed asap, any help would be great, pic attached......

 

Two thoughts come to mind. First is sunroof drains.

But second is checking around the cowl. The 2006 should already have the fix documented in this thread (but worth inspecting):
https://montecarloforum.com/forum/fw...lem-fix-26663/

 

parts request price from Baierl Chevrolet......

Good morning this is JR from baierl parts dept the part # you inquiring about is available cost is 89.97 plus tax, it is 3 days out from order date, also we would like the vin# of vehicle to confirm this is correct for your application, thank you for your inquiry

 

Which part are you getting?

Seems like a good deal (that its cheap and that its able to be had relatively quickly) assuming it fixes the problem.

I know your pain on this- my 99 gtp used to do the same (sunroof drains on that car).

 

yep, I understand but from the thread that was posted the part from a dealer is......It is really just a big piece of plastic but it's under $4 at the dealer.
GM Part # 15794785

I'm sure is has been discontinued by now for these year cars and there is a mark-up, but $89.00 is a bit steep...

OEM NEW Lower Frame Cowl Water Deflector 04-09 LaCrosse Monte Carlo 15794785

 

With the amount of water on the sill near where the door opens... have you pulled back the rubber at the bottom of the door and made sure the drain wasn't clogged up?

 

so, technically I don't need the part I'm referring to in the thread that Jason posted since mine is an 06? if only I read the whole post....wtf....

 

...does anyone here have a diagram of inside the sunroof area where the drain holes are?

 

Correct, in theory you should not need that $4 part. But, would not hurt to take the cowl apart and double check that the part is infact there (it wasn't removed or damaged somehow).

 

Attached are three PDFs. Best I can find from the shop book on this issue.