I had posted this in reply to the EMS show post, but thought I should make it a new thread, so it might help someone out with all the rain lately and save themselves some money in the process.

Went to leave for Ocala yesterday and found the 2006 Mustang had a passenger floorboard full of water!! Nice surprise. I've read of and know a couple of people who have had this problem who took it to the dealer for repair. Save yourself some money and check this first. There is a Ford TSB bulletin out for actual cowl sealant issues in the event this does not fix your problem.

Got to work on it today. Pulled the passenger side wiper cowl trim off and found the cowl drain in the bottom was plugged up causing the water level to rise high enough in there to allow water to come inside through the A/C micro filter.

At least it was an easy fix. If anyone else has this happen, email me. It can be done without even pulling the cowl trim off for drain access. However, if it has already occurred, you'll need to pull the wiper cowl trim anyway to change the now wet cabin filter. You can squeeze the rubber drain, pull it out the bottom, then rinse the cowl out, clean out the rubber drain, squeeze it back in the hole and re-seat it by gently pulling down on it.

This drain is located below/behind the battery on passenger side and in the same location on the drivers side. Be sure to clean both out while you're at it!

You can change the micro cabin filter by just removing the passenger side cowl/wiper trim piece. This is removed by removing 2 retainers and gently pulling it out of its snaps. Once removed, look into the recess and you'll see the filter. Gently pull out on the top of the filter and it comes right out. Do not damage the plastic frame, as the new filter will be inserted into this and reinstalled. I don't know if Auto zone or other retail outlets carry this filter, but the Ford Dealer is the best source. Once you've removed the old filter from the frame, inserted the new one, place the filter assy lower tabs into their slots and just press the filter back into place with a "snap". Thats it, you're done. I think it only goes in one way, but to be sure, ensure the foam seal is against the cowl side.

If you have oak trees near your house, you better check these drains annually. The blooms that come off are the problem. The cowls on these cars are great about not allowing big leaves, etc into that area, but the tiny bloom pieces accumulate, get wet, combine with sand/dust, make mud paste to clog up the drain!

From now on, when I do the summer oil change in June, I'm going to make it a habit to change the micro filter (cabin) and clean the drains. Cheap insurance against this happening again.

Now have to pick up some damp-rid to help dry out the interior. Been running a fan in it with windows down all day today after absorbing all I could by hand.