I have a loud clicking noise coming from under the passenger dash. Reading other threads it may be the recirculating door. But they are saying there is an access door on that model. Any idea how to get to it in a 2011 is 250?

 

The loud clicking noise you describe is often a broken servo arm, and is caused by ignoring the instruction to put the climate control into recirculate mode before replacing the cabin filter. Here is a thread concerning the fix: https://www.clublexus.com/forums/is-...g-to-circ.html