Your issues can not be answered easily or definitively, as the LS is very complex and all electronic.
I would need the stored codes,that set the check light (MIL Light)
You can cycle the right dash display to ACFilter and Reset,with the top row of buttons,in center of dash. There is no sensor on the Cabin Filter. All the dash displays, are just reminders,you can set any way you want, % wise.
Possible issues--Fuses
-- Coolant control valve
--DATC module
You will need a really good Technician,not a general mechanic, to diagnose your problem
You need to put a professional scanner on it, to start any diagnostic work
To clarify A/C Charging or any fluids for that matter.
If you need to charge or in the case of topping of fluids,you have a leak.
Repair the leaks,first.
Never charge an Air Conditioner System that leaks,as it is just irresponsible and polutes the atmosphere
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