I have 2009 LTD with AWD and have the chemical smell. I haven't had it in for that, but I have had it in for the whistling noise which absolutely drives me crazy. They replaced the thermal valve and the trans cooler line, but that didn't fix the problem. Now that I am aware of these boards, it sounds like it may be the fuel pump?? I love the way it drives, but I'm very sad about the two issues I have right now. It needs to go back in.
Good luck with yours.