I've got an 07 Limited 4x4 EL with the push button temperature and fan controls. Starting about a month ago, the controls have become unresponsive, and at times, erratic. Here are a few examples of what its doing:
1) Get in. Start the car. The air starts blasting. I click the "down" arrow to turn the fan down. Nothing happens. I click the 'Off' button to turn the whole system off. The lights go out, but the fan is still blowing like crazy.
2) Sometimes, while driving along, the fan will randomly kick into high. Turning it down or off does nothing.
Anybody have this problem? Any ideas on what to do?
I tried disconnecting the battery for about 15 minutes to see if maybe something would reset, but it is still messed up.
The in dash control unit has had some problems in the past. There might be another remote unit but I am not sure. Might be worth taking it to the dealer. If they say that unit needs to be replaced have them do it or get a used one. It's plug and play.
Yeah, I called and set up an appointment. 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....
Does it happen all the time or only some of the time?
One time, I was driving and the fan just turned full blast, scaring the bejesus out of me, and nothing I did to the climate control works. I had to shut the car off and turn it back on to fix it. Luckily, that happened only once.
Sounds like you blower motor resistor pack has gone bad. I had the same thing happen on my 2007 expedition, but I got lucky and it happened right before my warranty was up. It was an easy fix for the dealer.
You are the only other person that has described the issue just like mine.
Mine has done this for 3 years. They have replaced the AC head unit twice but it still does it every now and then. Have you noticed that it only goes haywire when using the "AUTO" temperature mode? If you use the manual mode to choose dash, floor, defrost, etc., it won't do this. Ours will make you jump when all of a suddent the fan starts blowing so fast it sounds like a leaf blower. Sometimes the fan stops after a few seconds of this. Cycling the ignition OFF then ON always fixes ours. Also, there is some correlation to having a cell phone or other device plugged into the 12v outlet on the lower dash.
I just found this TSB yesterday and took mine in to the dealer today. We'll see it this fixes it.
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.
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