Here is my problem. A few months ago I tried using the 4x4 on my 2003 f150, it didn't seem like i was in 4 because my rear tires just spun. The lights went on at least and i heard the knock noise that usually means it engaged. Now the lights dont say it is in 4x4 and i don't hear any kind of noise any more. All fuses on the truck are good.

The next problem i have is the ABS light is constantly on. Anything easy to fix for this?

My other problem is that my heated seats are working on the passenger's seat but not mine, which is wrong, I'm the one that drives it!..

My last problem is that the air conditioner seems to blow out the defrost vents instead of the panel vents making almost impossible to drive in the heat of Florida. How can i fix this problem??

Any possibility that These problems could be related and if not how can i fix these problems????