the heat only blows hot on 90 anymore, turn it one degree back to 89 and blows cold, truck has 70k miles on it today bought it brand new in 05' bought full extended warranty but guessing thats up, this normal? should i just take it to dealer?

Bad interior temp sensor. Above your head.

cheap item?? wheres this located above my head? is it the black thing on drivers side of overhead console next to visor?

i just figured out its the speaker looking thing in headliner above my head and how it causes the auto climate control not to work, ? is if it has to be replaced or just needs cleaning from dust? will try and mess wit it in the morning

This doo-hickey. http://www.dieselplace.com/forum/showthread.php?t=342544&highlight=temperature+sensor

Needs cleaned or replaced. Try cleaning first.

thanks will try n morning thanks alot! still dealing with rpm gauge sometimes readig low rpms, recently started not always but sometimes, heard it was common, the stepper motor or something, guessin dealer wont take care of it probly, also have bad steering wheel control bulb, and the drivers seat is trying to crack on its side above the controls and i've used conditioner once a month since day 1!

well i cleaned it! still does not work guess gotta order a new one!