Tried using the search function but didnt find anything. I have a 2007 Expedition EL Limited, the other day my wife leaves to go to work and no AC. Display is blank. When she gets off work cranks the car up and it is working fine. Now it has happened several more time, sometimes it works sometimes it doesnt. The display is always blankwhen it doesnt work. Anyone ever have this happen? Thanks in advance

 

I had the same symptoms on my '07. Replaced the module and haven't had any problems. Here is the TSB from Ford. Explains the problem and the fix. You do not need to do the re-wire. Just replace the part and put the new one in. Easy to fix. Remove the glove box, and the module sits in plain view.

Per the dealer, I ordered part 9L3Z19E624B which is new part number.

TSB 08-9-1
EATC BLOWER INTERMITTENTLY INOPERATIVE - STUCK ON HIGH/OFF
Publication Date: April 17, 2008
FORD:2007-2008 ExpeditionLINCOLN:2007-2008 Navigator

ISSUE:

Some 2007-2008 Expedition and Navigator vehicles equipped with Electronic Automatic Temperature Control (EATC) may exhibit a condition where the blower is inoperative no matter what speed or temp setting or the blower motor is stuck on high speed or off. Cycling the ignition may resume operation. The concern may also occur when using the electrical power point.
ACTION:

Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
Open the glove box and remove Connector C297 from the Heater Blower Controller Module (HBCM).
Remove the right front door scuff plate.
Remove the right side kick panel to gain access to Ground G200.
Cut black/white wire about 8" (20.3 cm) from C297. Strip the end 1/4" (6.3 mm).
Obtain pigtail kit and using the approved splicing methods found in the Wiring Diagram (WD), Cell 5, crimp the butt connector and seal (with shrink tubing) the splice between the 13" (33 cm) pigtail and the black/white wire from C297.
Disconnect the existing 14401 single ground eyelet from G200 and cut existing eyelet from the ground .
Strip 1/4" (6.3 mm) insulation from the 14401 ground wire.
Using the approved splicing methods found in the WD, Cell 5, crimp the butt connector and seal (with shrink tubing) the splice between the 3" (7.6 cm) pigtail and the 14401 wire.
Attach the new interlocked ground eyelet to G200. Torque to 11 ± 1.6 lb-ft (15 ± 2.3 N-m )
Install the right side kick panel and scuff plate.
Replace the HBCM.
Attach C297 to the HBCM.
Close the glove box door.
PART NUMBERPART NAME7L1Z-14S411-ABEyelet Wiring Pigtail Kit7C3Z-19E624-CHeater Blower Controller Module
WARRANTY STATUS:

Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

OPERATIONDESCRIPTIONTIME080901A2007-2008 Expedition/Navigator: Replace The HBCM, Includes Time To Isolate Ground (Do Not Use With 19700D8, 14200A)0.5 Hr.
DEALER CODING


That Heater blower control modual is the same as the electronic resistor.

 

Dont think thats it. Its like my ac controller doesnt have any power. No lights or anything on the controller.

 

Not sure if your problem is/was the same as mine. My HVAC screen would go completely blank as well. Turn off by itself. The only way it would work/come on was to turn the truck off for a period of time. It acted like nothing was wrong. New module, no problems. Knock on wood.