Anybody know off hand which motor to replace...

when the defrost is stuck on 100% of the time. Well it's not on 100%, but when I switch it on to dash vents, floor/dash only the defrost comes on. A part number would be fantastic if you have it. We have 4 motors correct, with 1 being a real bitch to get to (I'm betting that's the one I need to replace).

The bad one should 'click' 2-5 times when you first start the engine...

No clicking. Some times it'll already be on defrost as soon as I try and select the vents from the off position and other times it will switch from the dash vents/floor by itself. The defrost does turn on and off with the dial switch so I'm thinking that the switch is alright.

The one you need to replace is the one located behind the gauge cluster. Which means pulling the console, left knee panel, lower dash panel (under steering wheel), then pull cluster. Then use a combination of 1/4" extensions, elbow joints, and wobble sockets to get the two screws out. I did mine once and have to do it again. I have the Ford part # somewhere, I'll look tomorrow and post it.

Motorcraft YH1865. $38 at Amazon.

Something told me it was gonna be the difficult one. Thanks a ton for the directions and part #!

Mine did the same thing on my 2005. I simply unplugged the wiring connector to the motor and reconnected it and it started working properly

I've pulled the fuse but it didn't make much difference.