 My previous review was titled "Air conditioned seat - NO! Frozen butt - YES"  This is still a major problem.  Ford really screwed up the way the seats are cooled now and it is a real shame.   The second issue is that I have had more mechanical failures on this vehicle then my previous ones so I have downgraded my stars. At 24,000 the struts needed to be replaced and at 33,000 I had to have the throttle assembly replaced.  Luckily this was all under warranty.  On a good note, I purchased a 30 foot travel trailer and the Expedition is pulling it nicely with a weight distributing anti-sway hitch.  I had to change the exterior mirrors to an aftermarket brand because for some reason, Ford does not make a large telescoping mirror for the Expedition.  My original review follows.This is my 3rd Expedition and my second with air conditioned seats, well supposedly AC seats.  My previous one cooled your back along with your bottom and it was heavenly during the hot Florida summers.  This new one only cools your bottom and does nothing for your back, both front seats are this way.  In fact if you leave it on longer thinking that it will eventually get the back cold, it gets way too cold on the bottom, never reaches your back and you have to turn it off because it gets so uncomfortable.  I have complained to Ford and had it back to the dealer twice but they are telling me that the "seats are functioning as designed."  I say it is a design failure then!  I didn't pay for AC seats just to get my butt frozen.  EXTREAMLY disappointed in this 2105 design flaw.