Hi, on my 2000 TL, i get a clicking sound whenever the air system is on (heat/AC). It sounds like its coming from under the glovebox area near the foot area of the passenger seat. Anyone have any ideas?

 

sounds like something got inside the vents and is next to the blower motor

changed the cabin air filter? part runs from 12 to 20 bucks for a box of 2 filters,
they sit side by side in a plastic tray next to the blower
easy diy
see master diy list https://acurazine.com/forums/2g-tl-1999-2003-98/new-official-2nd-gen-tl-diy-thread-706083/
save that link to favorites- its your new best friend

note no need to use dremel to cut the tabs (assuming job never done before)]
kitchen scissors cut thru fast

and welcome to acurazine!

 

most find a mass of crud- need shop vac to get it all out

 

Air mix motor. The arm on it usually jams. Passenger side in engine compartment directly ahead of glovebox look for a thin cable going to the small about 1" heater hose. Spray some lube and work it around see if that helps loosen it up.

 

I done that also on mine, seemed to help.

 

sounds like something to add to the diy,,Lube heater core valve operating arm!!

same for throttle cable return springs at TB