What would cause the controls to stop working on a 2007 EB ,yesterday was a nice day and we had no need for the AC,just wanted to run the VENT setting and all we got was HEAT even setting the temp control down to 60 degrees,also lost all control over fan speed no matter how we set the speed control AND also I can't turn the system off also unless I turn the key off,had this Expy EB for 7 year's and never had this happen before,any idea's,thanks,poppie

 

Found this on the net,showed this to the shop foreman,they just called back and its fixed per this article, TSB 08-9-1 05/12/08 EATC BLOWER INTERMITTENTLY INOPERATIVE -STUCK ON HIGH/OFF FORD:2007-2008 Expedition LINCOLN:2007-2008 Navigator ISSUESome 2007-2008 Expedition and Navigator vehicles equipped with ElectronicAutomatic Temperature Control (EATC) may exhibit a condition where theblower motor is inoperative no matter what speed or temp setting or theblower motor is stuck on high speed or off. Cycling the ignition mayresume operation. The concern may also occur when using the electricalpower point. ACTIONFollow the Service Procedure steps to correct the condition. SERVICE PROCEDURE 1. Open the glove box and remove Connector C297 from the Heater BlowerController Module (HBCM). 2. Remove the right front door scuff plate. 3. Remove the right side kick panel to gain access to Ground G200. 4. Cut black/white wire about 8" (20.3 cm) from C297. Strip the end 1/4"(6.3 mm). 5. Obtain pigtail kit and using the approved splicing methods found in theWiring Diagram (WD), Cell 5, crimp the butt connector and seal (withshrink tubing) the splice between the 13" (33 cm) pigtail and theblack/white wire from C297. 6. Disconnect the existing 14401 single ground eyelet from G200 and cutexisting eyelet from the ground wire. 7. Strip 1/4" (6.3 mm) insulation from the 14401 ground wire. 8. Using the approved splicing methods found in the WD, Cell 5, crimp thebutt connector and seal (with shrink tubing) the splice between the 3"(7.6 cm) pigtail and the 14401 wire. 9. Attach the new interlocked ground eyelet to G200. Torque to 11 +/- 1.6lb-ft (15 +/- 2.3 N.m ) 10. Install the right side kick panel and scuff plate. 11. Replace the HBCM. 12. Attach C297 to the HBCM. 13. Close the glove box door. The control unit is $260, but they said I may be able to get by with replacing a couple of resistors. That would be nice. Planning for the worst though, and hoping for the best....

 

Well my 2008 Expy had a problem like this. My blower would not turn off, but I could adjust my temperature. Considering that this was my second Expy to have this problem I knew that I needed to change the front blower motor resistor. Cost me about $35 and about 1 hour of time.