Does a 2004 Lincoln Aviator have an interior air conditioner filter? Left side vent is blowing little air, have added coolant, didn't help with the blowing but did with the cooling some. Mechanic said he couldn't find filter

Question edited for clarity.
Question moved to model category.

Probably Positive Crankcase Ventilation (PCV) Hose

Pictures

https://www.google.com/search?q=2004+lincoln+aviator+vacuum+breather+hose

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Check all your fuses. It did blow a fuse. Since it is aftermarket the radio fuse may not be the fuse you need to check. Test all of them.

You have air in the system
It may work it's way out to the
recovery bottle over time as
it cools and draws in more cool,
so keep container full

I"m not sure if you have a vent hose
to bleed my lincoln ls does

Remove the radiator cap,warm up
when thermostat opens add more
coolant 50/50 or 60/40 Yellow GO5 I
believe

There are two things that you need to look at, one is antifreeze type, many newer cars use a red antifreeze and it cools better than the green, Also, look for air bleeds, usually little fittings that look like a grease fitting, or brake bleeder screw, AND have heater(s) on full hot when filling the cooling system. Pressure test and look for any leaks.

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

sucking air from intake manifold or other vaccum leaks ..possibly check brake booster vac line ..just some possibilities

Where ever you take it they are going to do an AC service. That involves evacuating the system of any remaining freon, pulling a vacuum in the system, seeing if the system holds the vacuum, and then recharging the system with freon and adding some type of leak detector dye to the freon. That can run anywhere from $40 to $90, depending on where you live and the labor rates where you live. You can call around to the different shops in your area and ask how much they charge to do an AC service.

My advice is to take the car to a certified a/c specialist as there are several things that can cause your problem

sounds like the air handler for the front is inoperative the wheel that operates it may be broken. its in the dash.

Get your ac filter replaced. My car did the same thing for a year until I figured out what the problem was.