Last post on Oct 15, 2012 at 3:07 PM
You are in the Ford Expedition
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Ford Expedition, SUV
#128 of 232 Re: Rear Air Conditioner thumping noise [mjeong]
Apr 25, 2010 (11:15 am)
I have a 2005 Expedition and have just experienced the same thumping noise. There are two actuators (DC motor/gear box assemblies) on the rear A/C unit. One apparently controls the flap that channels the air to either the ceiling vents or the floor vents. The other controls the temperature regulator. Like one of the other members, I removed the flap control unit, took it apart, and found a broken tooth from one of the plastic gears lying loose in the casing. Also, I agree with one of the other members about an apparent design flaw. That is, the control unit seems to keep torquing against the flap after it has aleady closed, rather than sensing the pressure and shutting off. Based on other blogs I've read, this unit has been a problem for many, many years. This, along with other nuissances, really makes me question if Ford (and other auto makers) really pay attention to what is going on. Apparently, they do not.
#129 of 232 Re: 2002 Ford Explorer Rear Air Conditioner Problem [jminier]
Apr 25, 2010 (11:35 am)
I have the same thumping noise with my 2005 Expedition. The other members have hit the nail on the head. It's a DC motor/gearbox assembly (opaque white box). There are two of these units in the rear A/C - one for controlling the flap that channels the air to the ceiling/floor vents and the other that controls the temp regulation. The flap control, which is the one with which I'm having problems, broke one of the teeth off the plastic gears inside the unit. Based on my observation, along with other members comments, this unit apparently keeps torquing on the flap door even after the flap closes. Over time, the plastic gear apparently weakens until the teeth snap off. It's a little aggravating to get to the unit (have to remove several interior trim panel to access the rear A/C), but it beats paying the repair shop. It's too bad that Ford (and other manufacturers) won't listen to its customers and fix apparent problems like this. It's obviously been a problem for many, many years .
#130 of 232 Re: 2002 Ford Explorer Rear Air Conditioner Problem [ptbruiser]
Apr 27, 2010 (4:15 pm)
I have a 2003 Ford Expedition and have to experienced the thumping noise in rear passenger side. When I turn on the back vents it starts the noise immediately. Also, my front vents do not blow but the back ones work well and the air conditioning works well. Any suggestions on what this might be.
#131 of 232 Re: 2002 Ford Explorer Rear Air Conditioner Problem [annhowell]
Apr 27, 2010 (6:10 pm)
The thumping is one of the blend door actuators in the back, there are two of them. When you change from floor to ceiling does the noise go away? If so, that is the actuator that is giving you the trouble, and it is easy to fix. The other one controls the temperature mix and is harder to get to. Easy fix once you are there though.
#132 of 232 2007 Expedition A/C
May 23, 2010 (5:44 pm)
I had my OEM a/c on my 2007 Expedition last year at a Ford dealer. Quite frankly, it's not cooling as well as the OEM a/c unit that was replaced. Is there a problem with the replacement units? I have taken it back to the dealer twice to have it checked out. Each time they tell me that it's working and cooling. I live in Houston and it's hot here.
#133 of 232 ac switching vents
May 26, 2010 (8:05 am)
When I run the ac on my 02 expedition xlt the ac switches for the front vents to the defrost vents about every 20 seconds. It still blows cold but it wont stop switching vents.
#134 of 232 Re: ac switching vents [bigboyford]
May 26, 2010 (8:37 am)
That is a vacuum leak. You should check the vacuum hoses under and around the battery tray, they tend to corrode.
#135 of 232 Re: ac switching vents [alwaysfords2]
May 27, 2010 (12:19 pm)
I have a 2003 Ford Expedition the rear air does not cool but front does. Any suggestions?
#136 of 232 Re: ac switching vents [randae]
May 27, 2010 (12:30 pm)
That sounds like it may be a blend door actuator in the rear. There are two - one controls the hot to cold mix, the other the floor to ceiling mix. When you turn the dial do you hear clicking from the right rear quarter?
#137 of 232 2007 Expedition
Jun 10, 2010 (7:50 am)
I have a 2007 Ford Expedition and have noticed that on long trips (especially on hot days) that the AC blowing "strength" decreases from the vents over time when it is on MAX AC, it still blows cool air, just the airflow decreases. If i turn off the car, and back on it comes back on to full strength for a while, but then gets weaker over time. Any ideas?