Where is the DATC module C228a located on 05' Lincoln LS? How about coolant control valve C1034?

https://www.google.com/search?q=2005+Lincoln+ls+cooling+system+wiring+diagram&tbm=isch&source=univ&sa=X&ved=2ahUKEwjT1er_s4bhAhUHD60KHfD3ATEQsAR6BAgAEAE&biw=1600&bih=789

Fuse box diagram.
https://www.autogenius.info/lincoln-ls-2000-2006-fuse-box-diagram/
Some good info on fan operation of you car on below link.
https://www.justanswer.com/ford-lincoln/7k3bc-lincoln-ls-05-lincoln-ls-cooling-fans.html

Just a thought: If you have two electric fans one comes on when you turn the A/C on the other does not come on till the car reaches normal operating engine coolant water temperature.

It is likely that the Coolant Control Valve on your car has failed. This valve is located on the passenger side of the radiator fan shroud near the bottom and has 3 coolant hoses connected to it. This valve regulates interior duct temp by changing the amount of water flow to the heater system.

You need a scanner to diagnose,not a code reader.

The DATC Module ( Dual Automatic Temperature Control Module) is a possible

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

The message means the electric park brake needs serviced. In this case I feel that considering the ac problem, the Coolant Control Valve is defective. The valve can create RF interference that messes with the electronics of the park brake system. The Coolant Control Valve is located at the right side bottom of the radiator fan shroud and has 3 heater hoses connected to it.

• The dual temperature control is inoperative/does not operate correctly

• Circuitry.
• DATC module configuration.
• DATC module.
• Coolant control valve.
• Low coolant level.
• Air trapped in coolant circuit.
• Incorrect heater hose connections.
• Air temperature sensors.

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Visual Inspection Chart Mechanical Electrical

• Loose, missing or damaged A/C compressor drive belt
• Loose or disconnected A/C clutch
• Broken or leaking refrigerant lines
• Obstructed in-vehicle temperature sensor
• Disconnected in-vehicle temperature aspirator hose
• A/C registers are not working (open/close)
• Front floor ducts not in place
• Incorrectly installed in-vehicle temperature sensor
• Incorrectly installed ambient air temperature sensor

• Fuse(s)
• Blower motor inoperative
• A/C compressor inoperative
• Circuit short/open.
• Disconnected, loose fitting, or incorrectly installed electrical connectors and pins
• Cooling fan inoperative
• Relays not functional or not installed

1. As pinpoint tests and measurements are being performed, be sure to inspect for any disconnected, loose fitting, or incorrectly installed component, module and in-line electrical connectors and pins.

1. If the inspection reveals obvious concerns that can be readily identified, repair as necessary.

1. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the vehicle selection cannot be entered:
   • check that the program card is correctly installed.
   • check the connections to the vehicle.
   • check the ignition switch position.
   • check that the battery voltage is greater than 9V.

--------------------------------------------
you can do this test

The DATC module self-test through the front panel display:

• can be initiated at any time. Normal operation of the system stops when the self-test is activated.
• is entered by pressing the OFF and FLOOR buttons simultaneously and then pressing the AUTO button within two seconds. The display will show counts of 1 to 25 in the center of the display window. Record all DTCs displayed.
• concludes by reporting all on-demand DTCs. Follow the diagnostics procedure given under ACTION in the DTC index for each DTC given.
• reports individual on-demand DTCs as four-digit DTCs (less the alpha character).
• will calibrate all the mode doors and check all analog inputs. The DATC module will only report on-demand (hard) faults that occurred while the DATC module was conducting its self-test.
• will light all control panel display segments if no faults are detected.
• will report individual on-demand DTCs without the °C symbol lit.

To exit the self-test, press any button. This will clear all on-demand codes from the DATC module memory. If no button is pushed DTCs will continue to be displayed.
Upon exit from the self-test the DATC module returns to operational status. The DATC module executes a hard (cold boot) reset which places the DATC system in the OFF mode.
If a condition exists but no DTCs appear during the self-test, GO to Symptom Chart Condition: The DATC System Is Inoperative, Intermittent or Incorrect Operation.
Always exit the self-test before powering the system down (system turned OFF).

2003
was a new model design. I have 2002 info.

you have about 4 doors that pivot and control air flow direction either by vacuum motors or electric motors. If system fails, the default is out of the defrost ducts to keep the windshield clear.

Try this test for 2002 system.

Front Panel DATC Module Self-Test (On-demand Diagnostic Trouble Codes—DTCs)
On-demand DTCs are those that are reported by an ECU when a failure is detected while executing a diagnostic test. For the DATC module this means that all faults (hard) that occur while the module is conducting a self-test shall be reported as an on-demand DTC.

• The DATC module self-test will not detect concerns associated with data link messages such as engine coolant temperature or vehicle speed signals. The scan tool must be used to retrieve these concerns.
• The vehicle interior temperature should be between 0-32°C (32-90°F) when carrying out the self-test. If the temperatures are not within the specified ranges, false temperature sensor DTCs may be displayed.

The DATC module self-test through the front panel display:

• can be initiated at any time. Normal operation of the system stops when the self-test is activated.
• is entered by pressing the OFF and FLOOR buttons simultaneously and then pressing the AUTO button within two seconds. The display will show counts of 1 to 25 in the center of the display window. Record all DTCs displayed.
• concludes by reporting all on-demand DTCs. Follow the diagnostics procedure given under ACTION in the DTC index for each DTC given.
• reports individual on-demand DTCs as four-digit DTCs (less the alpha character).
• will calibrate all the mode doors and check all analog inputs. The DATC module will only report on-demand (hard) faults that occurred while the DATC module was conducting its self-test.
• will light all control panel display segments if no faults are detected.
• will report individual on-demand DTCs without the °C symbol lit.

To exit the self-test, press any button. This will clear all on-demand codes from the DATC module memory. If no button is pushed DTCs will continue to be displayed.
Upon exit from the self-test the DATC module returns to operational status. The DATC module executes a hard (cold boot) reset which places the DATC system in the OFF mode.
If a condition exists but no DTCs appear during the self-test, GO to Symptom Chart Condition: The DATC System Is Inoperative, Intermittent or Incorrect Operation.
Always exit the self-test before powering the system down (system turned OFF).


PS. Where is air coming out in heat or cooling modes?

There can be several things that could cause this concern on a LS and coil packs are certainly one of them. However since the problem is more previlant when turning on climate control I would think problem may be the dual climate control valve is shorting out.The e popping up on your gear indicator is telling me that the network is getting knocked off line, kinda like your home computer rebooting during a lightning storm.
You can do a self test on the climate control,use the follwing sequence.
Front Panel DATC Module Display—Retrieve Continuous Diagnostic Trouble Codes (DTCs)
Continuous DTCs are fault codes recorded by the DATC module which have occurred during normal operation. For the DATC module this means that all faults (intermittent or hard) that occur while the module is in an operational state shall be reported as a continuous DTC.

• To retrieve continuous DTCs, press the OFF and PANEL buttons simultaneously, followed by pressing the AUTO button within two seconds.
• The DATC module will report all continuous DTCs to the vacuum fluorescent (VF) display.
• The DATC module will not carry out a self-test; it will only display continuous faults codes which are stored in memory.
• All VF display segments will light if no faults are detected.
• Individual continuous DTCs will be reported with the °C symbol lit.
• DTCs shall be reported as a four-digit DTC (less the alpha character).
• Pressing the front defrost button will exit the retrieve continuous DTCs mode and clear all continuous DTCs from DATC module memory.
• Pressing any other button (other than DEFROST) will exit the retrieve continuous DTCs mode and maintain all continuous DTCs in DATC module memory.
• Upon exit from the retrieve continuous DTCs mode the DATC module returns to operational status. The DATC module executes a hard (cold boot) reset which places the DATC system in the OFF mode.

If you hav e code 2798 or a 2800 then I would say this is definetly your concern and I would replace the dual climate control valve. it is located on the passenger side of vehicle next to the radiator,you will see coolant hoses going to it from the heater core.

Fuse/Relay
Location
Fuse Amp
Rating
Passenger Compartment
Fuse Panel Description
9 10A Right Front Low Beam
10 5A Left Front Turn, Left Front Repeater, Left
Front Sidemarker, Left Front Park Lamps
11 10A Left Front High Beam
12 — Not Used
13 5A Cluster
14 10A RCM, DATC
15 5A Not Used (Spare)
16 5A E/C Mirror, Heated Seat Controls, RSM
(Rain Sensor Module)
17 5A RCM, Alternator Warning Lamp
18 20A Radio, CIA
19 15A Tilt/Tele Motors
20 10A FEM, DATC, Cluster, Brake Shift Interlock,
REM
21 10A Power Folding Mirrors
22 10A DDM
23 10A Right Front High Beam
24 5A PATS
25 10A Left Front Low Beam
26 10A Wiper Relay, Windshield Washer
27 10A Radio, Cellphone
28 5A Security Horn
29 5A Trailer Tow Ignition Sense, VEMS, FEM
30 5A FEM
31 — Not Used
32 20A Cigar Lighter
33 10A Switch Backlighting
34 10A Not Used (Spare)
35 5A Stop Lamp Signal