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I'm not sure if you can or not easily. You should get the shop manual and check out the skematics and see what the differences are. There are more sensors and modules for the EATC than there are for manual climate control. If the wire harnesses are the same, it's possible. If not, it's a major job as the harenesses will have to be changed out. And you'll have to have all the modules and sensors, etc for EATC. And it will probably require that the instrument panel be removed to do the change.
The more I think about it my truck has a temp sensor under the TRIP/RESET buttons in the cab and a sunload sensor in the dash. Im not sure if they prewire all this stuff from the factory.
yes, it is possible.... but you will need the auto climate controller, and a new fuse panel for the passenger kick panel which is wired for it. i did some researching on here a couple months ago, and it will cost about 350.00 IIRC.