No cabin heat on lincoln ls - 2004 Lincoln LS

No cabin filters under the seats

The cabin filter is on the passenger side,
in the engine compartment, under the plastic
wiper cowl cover

Remove the wiper arms,the push pins & wiper cowl

Those round filters under the seats, are for the
heated & cooled seat motors

Leave them alone they will be fine,don't get dirty

google "How do i change cabin filter in 2003 lincoln ls" u-tube demo comes right up

Are you talking about the Cabin Air Filter? The message center will show that "Change A/C filter" when its time to change that. It is located under the cowl near the firewall. Its behind the engine near the cabin

Have it checked for a broken blend door actuator shaft.

For instructions go to www.micronAir.com you can print ut the instructions.
If you go to micronair.com and try to find the instructions for changing a lincoln ls cabin filter you will be disappointed because the lincoln is not one of the cars found on this list. A general search of lincoln ls & cabin filter will yeild many results with the pertinent information.
Once on www.micronAir.com, click on the US section at the top of the page.
There you will find Lincolns. I did.

You can see most of it under the dash up high
behind the glove box

The connectors are near the firewall in engine
compartment

Have to remove the cabin filter box to see them

Yes, it is technically called a pollen filter. Cheap on ebay. It is under the leaf screen at teh base of teh winshield. Remove wiper arms and leaf screen for access.

PCM-Behind Glove Box,inside car,you can see and feel it.
-connectors are outside in engine compartment,under Cabin Filter Housing

Passenger side,open hood,remove most of the push pins, holding wiper cowl grill to cross brace.
Under the plastic cover is a box with another cover, and inside the cabin filter.
They are expensive and last about 3 years
Get real dirty after two

You will break a few push pins and the dealers don't stock and they are too expensive,like $3.20 ea
Use wire ties until I find a source at auto body supply houses

It's located on the engine compartment firewall, passenger-side. Open the hood, stand by the right front wheel and you'll see the fasteners to remove forward of the wipers. Fasteners are removed by pushing the center in, then pulling them out. To replace. pull the center out, replace it, then push it flush to lock.

Good luck and hope this helps.