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A common problem with 2002 LS's are the DCCV, (Dual Climate Control Valve). Pretty expensive, so I suggest finding someone who know's how to reset the climate control and see if that helps. Other than that, you might need to check the DCCV. Also, a no-brainer, make sure your R-134a is topped off. Hope this helps.
Have Auto Parts Store reset it , will do this for free.
I have a 2002 Lincoln ls and mine is located in the d/s panel by your left foot. Pull the panel and its a red button
Where is camshaft sensor on 2002 Lincoln ls
Unplug battery for 30 minutes then plug back on that will reset the ecm
What is the firing order of a v6 lincoln ls 2002?
where is the 5 coil located on a 2002 Lincoln ls
broken dccv... look for dual climate control valve in the answers...
On a 2002 Lincoln LS : ( 68 litres / 18 U.S. gallons )
Change the filter and hit the reset button on the information center which is located above the radio. If the above fails take it to a dealer and have them reset it.
You can refer to your user manual to see the fuse diagram for a 2002 Lincoln LS.
heater Control valve for 2002 Lincoln Ls